Are you really going to deny that most believers don't believe what they do because of the accident of where, and into which culture, they were born? Of course they do! And they tend to stay with their religion of birth because of those rituals that trap them in as little babies, many years before they can think for themselves, not to speak of the indoctrination to come in the years to follow. Do you really think that most Muslims/Jews/Catholics are converts, seduced by the many irresistible attractions of their chosen faith? Hahaha!