Lifelong materialists come back with a felt knowing that consciousness is primary. The experience does not respect prior worldview, did not consult the survivor's religious affiliation, and does not stop arriving inside committed atheists and skeptics. The hunger to understand what they experienced does not fade, often for decades.
One of the unusual features of the NDE literature is how poorly the experience tracks the survivor's prior beliefs. Devout Christians have the same core experience as lifelong atheists. Children too young to have a theology have it. Buddhists, Muslims, Hindus, secular Jews, agnostics, materialists, and people who had never thought about the question all report the same underlying structure: separation from the body, awareness, light, the felt presence of an organizing intelligence, a sense of love that exceeds the language they have for it.
Atheists who had the experience generally do not report converting to a specific religion. They report something stranger: a felt certainty, post-experience, that consciousness is more fundamental than matter. They cannot square it with their pre-experience worldview, and they cannot deny what happened. Most of them spend years trying to find frameworks that can hold both the experience and their epistemological standards.
"I am a physicist. I do not believe in a sky god, I do not believe in heaven, I have not changed those views. What changed is that I now know, from the inside, that my consciousness is not the same as my brain. I do not know what that means in the equations. I know it the way I know my own hand. I have read everything I can find on the consciousness problem since the surgery. I have written a paper that I will not publish in my lifetime, because the field is not ready. The hunger to understand has been the dominant feature of my intellectual life for nineteen years." — physicist's interview, IANDS academic panel, 2015
Survivors describe the spiritual hunger as different from a religious search. It is less about finding the right tradition and more about finding language adequate to the experience. Survivors read widely: the mystics, the consciousness researchers, the physicists, the contemplative traditions, the philosophers of mind, sometimes the parapsychology literature. They are not looking for community in the church-membership sense. They are looking for company in the cognitive sense, for other people who have noticed the same thing and who have done the work of trying to think about it carefully.
Many find a partial home in contemplative traditions that downplay belief and emphasize direct experience: Christian contemplative prayer (Thomas Merton, Cynthia Bourgeault), Zen Buddhism, advaita Vedanta, Sufism. Some find a partial home in the consciousness-research community, where the experience is taken seriously as a data point. Most piece together a working framework from several traditions and from their own continued reflection.
The experience contradicts strict materialism in a way the survivor cannot dismiss. The standard materialist account is that subjective experience is fully produced by brain activity. The NDE, especially in cardiac-arrest cases where the brain is not producing measurable activity, occurred in a state that the strict-materialist account says should be incompatible with experience. The survivor remembers the experience. They cannot un-remember it. The materialist framework no longer accommodates the data the survivor now has.
The experience installed a felt knowing that is harder to argue with than a belief. Beliefs can be argued against. The survivor's spiritual hunger is not anchored in a belief that someone could talk them out of. It is anchored in the texture of the experience itself, which they have a continuous memory of, and which functions for them as evidence in the way that personal experience functions as evidence in every other domain.
The mystical-state literature gives this a category. William James, in The Varieties of Religious Experience (1902), identified four marks of the mystical state, one of which is "noetic quality": the experience is felt to be a form of knowledge, not a feeling. Survivors describe the NDE as noetic in precisely James's sense. The hunger that follows is the survivor's attempt to integrate that knowledge with the rest of what they know.
The literature on terror management and existential motivation. A more secular framing. The standard atheist worldview provided a stable cognitive structure for managing mortality (death is the end, deal with it). The NDE undermined that structure from the inside. The survivor is now trying to build a new structure that can hold what they experienced, and the hunger is the cognitive work of construction.
At ten- and twenty-year follow-up, formerly-atheist NDE survivors usually have not joined a religion in the membership sense. They typically describe themselves as spiritual or as not religious, often using language closer to consciousness research, perennial philosophy, or contemplative practice. They generally do not return to strict materialism. They do not generally become hostile to their pre-experience colleagues who remained materialists. They tend to describe a position that is patient, careful, and unwilling to overclaim, which is consistent with the philosophical training many of them had before the experience.