Women who still deals with internalized fundamentalism looking at her phone and making a frustrated gesture

Why Fundamentalism Often Lingers—Even After Deconstruction

ByMegan Von Fricken
Pinterest image with the Title: Why Fundamentalism Often Lingers—Even After Deconstruction

This post explores internalized fundamentalism as a trauma response that can persist after leaving a high-control religion.

It breaks down how fundamentalist dynamics shape a person’s relationship to certainty, authority, and being “right,” and how those dynamics can become internal.

You’ll learn common ways internalized fundamentalism shows up, including self-surveillance and anxiety around being wrong.

Internalized fundamentalism is a term I like to use to describe the way the rigidity of a high-control religion lingers in your nervous system, even after you’ve left the high-control group and fully deconstructed your faith.

Though you might no longer believe the doctrine, you still find yourself following rigid rules, engaging in black-and-white thinking, or a looking to a new authority that tells you what is “right.”

Being indoctrinated into a high-control religion often means rigid rules and absolute truth claims were connected to belonging, stability, community, and sometimes even survival.

And when you’re in this type of environment for long enough, it can start to feel safer to have a specific structure to follow and to avoid ambiguity and nuance.

That adaptation makes a lot of sense when your environment is highly demanding and chronically stressful.

However, when it lingers in your nervous system even after leaving, it can show up as anxiety around uncertainty, compulsive second-guessing, black-and-white thinking, or a quick urge to anchor yourself to a new ideology that offers the same sense of certainty.

In this article, I’ll go into more depth about the concept of internalized fundamentalism, why it functions like a trauma response, how it tends to show up after religious exit, and what it can look like to rebuild a relationship with nuance, flexibility, and choice.

What We’ll Be Covering:

What’s a Fundamentalist?

In general, “fundamentalism” is a way of viewing the world with a rigid perspective of what is right.

While I was raised in fundamentalist Evangelical Christianity, there are plenty of other high control religious groups that are fundamentalist in nature as well (even though most of them shy away from the label “fundamentalist”).

In fact, fundamentalism can apply to people, groups and organizations that are totally separate from religious groups—such as in the case of political parties, fitness communities, and dietary approaches.

In essence, fundamentalism is the belief that a single way of thinking is the only correct way to view the world and any deviation from this way of thinking is unacceptable.

Characteristics of a Fundamentalist

Fundamentalism can show up in a lot of different belief systems, but the underlying dynamics tend to be pretty recognizable.

Here are some common characteristics:

  • Rigid beliefs and practices:
  • Strong adherence to strict rules and doctrines, with very little room for nuance, complexity, or personal context.
  • Black-and-white thinking:
  • An all-or-nothing way of interpreting and applying beliefs, where “gray areas” are dismissed as compromise or corruption.
  • Moral superiority:
  • A strong sense of being “right,” which can lead to judgment and contempt toward anyone who does not align with the in-group’s standards.
  • Need for control and authority:
  • A drive to maintain control over beliefs, behavior, and belonging, based on the conviction that there is only one right way to live.
  • Hostility toward dissent:
  • Dissent, questions, or doubt may be treated as a threat and met with defensiveness, punishment, exclusion, or hostility.

Harms Associated with Being a Fundamentalist

On the surface, fundamentalism can look like “strong conviction.”

But when someone is living inside a rigid framework where being wrong feels dangerous, that rigidity tends to come with real costs.

Here are some of the most common harms:

  • Heightened fear and anxiety:
  • Narrow, rigid perspectives make it hard to tolerate uncertainty, which can create fear and anxiety when someone is faced with conflicting ideas or beliefs.
  • Mental health strain:
  • When a person feels pressure to maintain a rigid framework despite contradictory evidence, issues like anxiety, depression, and OCD can develop or intensify.
  • Loss of identity and autonomy:
  • Strong emphasis on conformity can pressure people to suppress their own needs and preferences, which can erode a sense of self over time.
  • Harm and discrimination:
  • Fundamentalist beliefs often reinforce discriminatory ideas about marginalized groups, which can cause harm and make it harder to form safe, inclusive relationships.
  • Social isolation and “us vs them” thinking:
  • Fundamentalism can foster an “in-group versus out-group” mindset that cuts people off from connection and increases shame, suspicion, or hostility.
  • Restricted critical thinking and growth:
  • When questioning is treated as a threat, it becomes harder to think critically, learn, and consider alternative perspectives.
  • Increased risk of extremist behavior:
  • In more extreme cases, rigid moral certainty can fuel harassment, coercion, or violence against those who do not share the same beliefs.

Understanding Internalized Fundamentalism

Internalized fundamentalism is what happens when a fundamentalist way of relating to safety and authority becomes embedded in your nervous system.

If you have left a high-control religion and deconstructed your faith, your beliefs may have changed while your body still responds to uncertainty like it is a threat.

In real life, this can show up in moments where you feel pressure to be right, make the perfect choice, or find someone else to tell you what’s true.

This can mean that even when you no longer believe the theology, you may still:

  • feel anxious about being wrong
  • notice your mind snapping back to all-or-nothing conclusions
  • experience fear or shame in situations where you “break the rules,” even if you do not agree with those rules anymore
  • look for an external authority to tell you what to do

I noticed all these things continuing to show up in my life even after deconverting from Evangelical Christianity as I found myself channeling my internalized fundamentalism into my dietary choices and my spiritual orientation toward the world.

While I was no longer “religious,” the same need for certainty and a clear framework showed up in these other areas of my life.

How Fundamentalism Becomes Internalized (as a Trauma Response)

I think it’s most helpful to think about internalized fundamentalism as a trauma response. Essentially, it’s adaptation in the nervous system to living under chronic, externally-imposed stress.

When you’re indoctrinated into a high-control religion, strict rules and absolutes can get wired into your mind and body as a reliable way to stay safe.

This is often compounded by phobia indoctrination.

Phobia indoctrination is a coercive tactic used by many high-control religions to maintain control by exploiting fear and instilling phobias about what happens if you leave, doubt, disobey, or “get it wrong.”

Eventually, your nervous system can start to treat certainty like safety.

Over time, many people absorb a few core “rules” about how to stay protected:

  • certainty reduces risk
  • obedience prevents harm
  • disagreement threatens belonging
  • doubt leads to punishment

That learning makes sense inside a high-control religion, where questioning can come with real consequences.

The shift into internalized fundamentalism is that these threat calculations can linger after you leave. Even when you consciously reject the belief system, your body may still react as if being wrong could cost you safety or belonging.

Common Outcomes of Internalized Fundamentalism

Because internalized fundamentalism is happening internally, the outcomes often show up less as overt religious behavior and more as self-surveillance.

It can look like:

  • Shame and guilt:
  • You feel like you are failing some invisible standard, even when the “standard” no longer matches your values.
  • Perfectionism and anxiety:
  • You over-prepare, over-research, or over-correct because the stakes of being wrong feel high.
  • Chronic second-guessing:
  • Decision-making can feel loaded, especially without external validation.
  • Black-and-white thinking:
  • Your mind snaps toward all-or-nothing interpretations, even when you want to hold nuance.
  • A quick urge to adopt a new framework:
  • When uncertainty spikes, it can feel calming to attach to a new set of rules, labels, or absolutes.
  • Judgment toward others:
  • Critiquing other people’s choices can become a way to reassure yourself that you are on the “right” side of the line.

Is Being a Fundamentalist All Bad?

While internalized fundamentalism can have negative effects on our growth and relationships, it’s important to recognize that some aspects of fundamentalist may actually be positive.

For example, having a strong sense of morality and adhering to certain principles may be valuable.

However, when these beliefs become rigid and absolute, they can restrict growth and hinder our ability to understand and connect with others in healthy ways.

With that being said, let’s compare and contrast some of the positive and negative aspects of fundamentalism.

Positive Aspects of Fundamentalism

Fundamentalism, when viewed positively, can create a sense of unity and camaraderie among its followers.

When you buy into a particular ideology or belief system, you’ll likely have a greater sense of stability and certainty during times of societal change or upheaval.

Furthermore, fundamentalist beliefs often inspire you to live a disciplined life while also offering a sense of belonging, identity, and purpose .

Here are a few of the positives of fundamentalism:

  • Strong Moral Framework: 
  • Fundamentalism often results in a strong sense of morality. This can provide people with a clear guidance system for making decisions in their lives.
  • Consistency: 
  • Given its rigid nature, fundamentalism can provide a consistent structure and routine in life, which can be stabilizing and a source of comfort, especially for those who have experienced chaos in their lives.
  • Unity and Community: 
  • Shared beliefs foster a sense of community and unity among those who adhere to the same fundamentalist ideas.
  • Purpose and Direction: 
  • Fundamentalist thinking often provides people with a sense of purpose and direction in life, giving meaning to their actions and experiences.
  • Resilience: 
  • The strong belief system of a fundamentalist can often make them resilient in the face of adversity, as they have a clear purpose and moral compass to guide them.

Negative Aspects of Fundamentalism

Ok, now that we’ve considered some of the potential positive aspects of fundamentalism, let’s balance it out against some pretty clear negatives.

Fundamentalism restricts our ability to see the nuances and complexities of life, and it also makes change more difficult, even though something might no longer be serving you.

Additionally, understanding other perspectives is challenging, and you have more resistance towards new ideas and information that may actually yield positive outcomes in your life.

Here are a few of the negatives of fundamentalism:

  • Intolerance: 
  • Fundamentalist thinking can lead to a lack of tolerance for different beliefs and values, impeding understanding and creating divisiveness.
  • Rigidity: 
  • The unwavering nature of fundamentalist beliefs can make adaptation to new situations or information difficult.
  • Resistance to Growth: 
  • By holding onto rigid beliefs, opportunities for personal growth and learning is often limited.
  • Conflict: 
  • Strong adherence to one’s own beliefs can often lead to conflict with those who hold different views.
  • Limited Perspective: 
  • A fundamentalist viewpoint often restricts the ability to appreciate the complexities and nuances inherent in life, limiting one’s perspective and appreciation of diversity.
  • Isolation: 
  • The rigidity of fundamentalist thinking can lead to social isolation if one’s beliefs are not shared by others.
Neurodiverse woman reading a book while sitting on a couch learning about fundamentalism

Fundamentalism vs Neurodiversity

While fundamentalism and neurodiversity may seem like unrelated topics, there are some overlapping characteristics between the two.

I wanted to take note of some of the parallels and differences because when I discuss the rigidity and black & white thinking of fundamentalism on social media, I often have people ask how to tell whether it’s really fundamentalism or actually a manifestation of their ADHD or Autism.

This is such an important question, and I hope the information below can provide some clarity.

Parallels Between Fundamentalism & Neurodiversity

This is not an exhaustive list nor is it meant to be reflective of every person’s experience.

These are just a few of the potential areas of overlap between neurodiversity and fundamentalism.

  • Resistance to Change: 
  • Neurodiverse folks tend to struggle with change and new information, similar to the rigidity seen in fundamentalist thinking.
  • Social Isolation: 
  • Neurodiverse folks may also experience social isolation due to differences in perception and communication styles, similar to the potential isolation experienced by fundamentalists who seem to “speak their own language.”
  • Limited Perspectives: 
  • People with neurodiversity may also struggle with limited perspectives due to often thinking in “absolutes” and “black & white,” which is very similar to the thinking patterns of fundamentalists.
  • Potential for Conflict: 
  • Both fundamentalists and folks with neurodiversity may experience conflicts with others who hold different beliefs or perspectives due to strongly held convictions.

Differences Between Fundamentalism & Neurodiversity

In my opinion, while there are a few areas of overlap between neurodiversity and embodied fundamentalism (which I reviewed above), there are quite a few more differences between the two.

Again, this is not meant to be an exhaustive list or reflective of everyone’s experience, but these are the differences I have seen.

  • The Source of Rigidity: 
  • While fundamentalist thinking is often rooted in strong beliefs and resistance to change, either due to trauma or childhood conditioning , the rigidity in neurodiverse folks often stems from differences in the way the brain processes information.
  • Intentions: 
  • Fundamentalists may hold their beliefs with the intention of converting or persuading others, while neurodiverse folks are usually trying to navigate their own experiences and perspectives.
  • Impact on Mental Health: 
  • Fundamentalist beliefs can sometimes lead to negative impacts on mental health, whereas neurodiversity itself is not a mental health disorder.
  • Intervention: 
  • While fundamentalist thinking can (and should) be challenged and potentially changed through education and exposure to different perspectives, neurodiversity itself does not require treatment or “fixing” as it is a natural part of human diversity.
  • Communication: People with fundamentalist beliefs may struggle with open-minded communication due to their strong convictions, while neurodiverse folks may face challenges in communicating effectively due to differences in processing and social cues.

In considering the ways neurodiversity may overlap with fundamentalism, consider the categories I mentioned above of positive aspects of fundamentalism and negative aspects of fundamentalism.

Where the overlap exists between fundamentalism and neurodiversity, many neurodiverse folks representative of the positive aspects of fundamentalism and help balance out the ecosystem of humanity.

Beginning to Recover

If the phrase “internalized fundamentalism” resonates with you, it’s meant to be information, not a punitive label.

It’s simply one way to describe something that often develops after living in a high-control system because it helped you maintain safety, belonging, and attachment.

But once you are out, you deserve more options than compliance, perfectionism, or fear.

If internalized fundamentalism is contributing to stress, anxiety, or other mental health strain, trauma work can help. Often the goal with trauma work in this context is to cultivate more internal safety.

As that happens, discernment can start to come from your own inner reference point, rather than from rigid rules that are meant to keep you safe.

This process is usually gradual, and it often comes with a lot of practice and a lot of compassion.

But, over time, it can be possible to recover from the need for certainty and to build a more flexible relationship with yourself and the world.

Some Possible Next Steps:

If this article resonated with you and you’re wondering where to go from here, you might consider the following options:

If you’re ready to do some focused work around religious deprogramming or nervous-system recovery, and you want to work with someone who “gets it,” you might consider working with me one on one.

I am a trained psychotherapist and now offer clinically-informed coaching for clients world-wide who are trying to make sense of their experience with religious indoctrination and heal at a deeper level.

Learn More

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Religious harm thrives in the dark, so the more we can all work together to shine a light on some of these issues, the more likely it is that others will find the same freedom from coercive control that we have found.

The Religious Harm Recovery Community is an intentional space where folks who have left a high-control religion can connect with others who “get it.

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