Of people who try Christianity and then turn away from it I see a lot of impatience. Maybe not realizing it but going to church with a real let it ride attitude. First time something doesn't go their way or they're left w/out an answer the who notion of there being a god becomes idiotic and they scoff at anyone sticking around for the Memorial day w/e picnic.
There are plenty of bad churches and practices that dissuade people from growing spiritually. I get that. Plenty of people think it's just stupid not to be top dog of their own life. My perception has been that those who've rejected the notion of there being a god don't have things any better than those who have. If there's no god and people are their own master, then what's left for me or for anyone?
I think there's an under estimation of what believers get from their walk. I've never really been trouble about how the universe came into existence. I've never had to tussle w/the duality of there being suffering in the world and if that precludes the notion of there being a god. I'm also not so sure if people who required such answers would be any more prone to seek God if they got a detailed answer in an e-mail from the customer service dept from heaven.
As per the O.P, I did grow up in a Christian home. It was prolly more of a moral base for me. It wasn't until I was on my own in my 20's that I really sought out a relationship w/Christ. Being a Christian I've found love, purpose, opportunity, growth, and healing. I've had disappointments, made tough sacrifices and hurts. As an INTP, big picture person, I can say that nothing I've chosen in God has not presented itself as a greater good, more sound long term choice. From what's happened to help me in my life and seeing how it's helped others, it'd be ridiculous for me to dismiss it all as coincidence, illogical or being ill-informed.