I've seen it go both ways. Many who were atheist/agnostic end up finally accepting God, and sometimes the faithful lose their faith. I've seen more of the former than the ladder, but I have seen both. Personally, it strengthened my faith to understand the development of modern Christian belief. I also found it fascinating to study the details of other faiths as well even though Catholicism is where my faith is 'at home'. If you are going to accept/reject God as an adult, you should do so on a basis of knowledge and not ignorance - which far too many do.