Moving, causing, surviving. That’s why animals have a central nervous system. And that’s how a religious person ought to lose faith in God: on the move.
Simulation (mimicry) is included under ‘moving’.
The best way for a religious person who already doubts his faith, but doesn’t know how to go on, is to enter into learning relationships with atheists. Such relationships, mediated by goodwill and the sincere desire to learn, allow the religious doubter to ‘try out’ atheism, to simulate it for its effects on self and others. Multiple simulations should be attempted. Slow cure is all important. These experiences must be largely positive to induce attachment.
Sudden and dramatic loss of faith almost never happens, if ever, for the reward system in the brain needs to re-tune itself out of the current attractor-category (religion) and into the new attractor-category (atheism). This change takes time; sometimes years.
To lose faith in God, you need to do something. You do this by first copying others who are already masters of the game.
What is religion? If this question asks what all religions have in common, then the answer is: next question, please.
What do all religions have in common? Nothing.
In contrast to Christianity, Islam and Judaism, Buddhism is atheistic with regard to a creator god. There is no doctrine of karma in Christianity. Hinduism is opulently polythesitic, but Islam is not. And so on.
In this kind of situation, it is more promising to offer a simile. What is religion like? Religion is like a cord composed of braided strands (e.g., a rope). The strands overlap and lie over each other in complex ways. The integrity of the cord does not consist in one strand, but in the arrangement of many strands.
Take any family. Look at the faces of its members. Do they have one facial feature in common? No. There are both similarities (e.g., eye color), and differences (e.g., face contour). The relationships are complex, not simple. That is how it is. Just look and see for yourself.
Religion is extremely complex. To make a decent start at understanding it, good questions need to be asked. This is not easy. So, I urge looking first. What is observed? Compare your visual experiences. Look first, ask questions later.
I am too honest to be religious. Religion lains waste to honest reflection and questioning.
Many people claim to be religious. How many are pretenders?
There may be good reasons why a person pretends to be religious. A religious son adores his devout mother so much that he could not bare her to learn of his atheism. However, unknown to him and family, the mother is an atheist, and has been for decades. Like the son, she became a religious pretender in order to protect her mother’s feelings, and so on.
How to break this circle of lies? Honest reflection and questioning. And that takes great courage.