I read some Carlis Castaneda many years ago and his psychedelic experiences. There is, I believe, a difference between a spiritual or religious experience and actually joining a specific church with all its dogma.
I also came across the “4-14” concept in my searches. The ages at which fundamentalists try to bring kids into the fold. The ages at which they are the most malleable. They found that indoctrination during that window increases the likelihood of them remaining.
I’ll give my mother-in-law and wife as examples. My MIL was raised in the Mormon church, but strayed away. As a young girl, my wife was baptized into the church, but was never really active. Both however, periodically talked about the subtle fear they had leaving the church. That kind of shit beat into you at an early age is difficult to shed.