Faith for me when I was a Christian came from the people around me. I grew up Christian, a lot of my friends were Christian, most of my family was Christian, I went to several Christian churches, I was given a children's bible (pictures mostly, sadly I saw no dinosaurs on the Ark), I was encouraged to go to Christian events, I was dissuaded from trick-or-treating (but I kept doing it, freaking free candy man, who wouldn't?) and so forth.
There was no questioning it. It was a part of my life. God was there. I prayed. He answered sometimes, the times he didn't I attributed to "he must be busy", "I was arrogantly testing him" or simply "it was all part of his plan". I admit I never read the Bible in entirety, just followed the pastor/priest on where to flip the page.
Atheists, Muslims, Hindus, Buddhists, Jews, and so forth, to me, were all wrong. But I felt a bit uneasy. How can so many people be wrong? Are they ALL going to hell?
Then I saw the world.
Then I read the Bible, the Qur'an and other literature.
Then I began to doubt and question.
I threw away Christian faith, was scared for a short period of time of death, the very idea of me ceasing to exist in a void after life was terrifying.
I became slightly peeved and angry at the people who I sort of "respected", such as the pastor. When I confronted him, the best thing he could say was "I don't know".
Suffice to say, the whole losing faith was worth it for me.