I was, as was most of my friends when I was young, brought up in a half arsed sort of Catholicism. My mum had her own, mixed up sort of faith but didn't try to push it on me and my brother.
Catholic school but, by the age of about 6 or 7, I think most people had figured there wasn't anything to it.
I have prayed since then, though. When I was 12 my friend developed leukemia and I prayed that, if there was a God, please could they save him. Please, please, please could they save him. I would commit to religion, I'd stop blaspheming, I'd become a nun if necessary.
He died about six months later. He was 13 years old. He was a brilliant, clever, funny, kind person who died a horrible, horrible death.
Of the religious leaders who visited his parents, I have by far the most respect for the Catholic priest who, when the mother said quite firmly that she couldn't believe a loving God could do something like that, he just said okay.
The Calvinist, the Baptist, the Evangelist ministers all had a variant of "God works in mysterious ways... But have you considered that if you hadn't led a life of sin (unmarried, non church going etc) then perhaps God would not have seen fit to punish you."
God wasn't done yet. When, a few years later, they tried to conceive, there was miscarriage after miscarriage (as there apparently had been before they conceived my friend) ending in a baby who only lived a few days.
My friend's mother killed herself. She was 43. Apparently, that's a sin as well.
I do not believe in a God. I certainly don't believe in a God worth worshipping. However, if any of the theists on this thread, especially those who've started believing after a car crash or cancer diagnosis or something, would like to explain to me why your all powerful, all loving God let a thirteen year old die, let his mother suffer loss after loss, create a baby with only four days of life... Well, I'd be all ears.