oh man, that's a fantastic question! I grew up as secular as coud be. Religion was the furthest thing from my mind. I always believed in something bigger, but organized religion...I hated it.
But one thing led to another, I started reading more. Started following the history of the church and how it came to be. The gospels, the history of them.
I just couldn't deny it. As deep as I dug, my answers always led back to the bible and God. For me it was a case of just the more I learned, the bigger my faith grew.