For Christians who claim to prove "God"s existence, is it the Bible you believe?

Is this why you believe? Surely not, because you believed before ever fully understanding the bible. So tell me why you first believed. That is much more interesting to me. I want to know what brought you to believe in the first place. Which religious or non-religious options did you consider before choosing Christianity? What program of study did you follow in doing so? What works of a skeptical nature did you consider before making your choice?