I really, really tried to buy into the delusion. Really really. With every fibre of my being. (I was young, and on an unrelated note, mentally ill at the time.) I wasn' stupid, but I wasn't thinking
Couldn't do it. It was such a relief when I realised that you don't have to believe that god exists. Not in the way, for e.g. you sort of have to believe in the kitchen table, or the force of gravity.
Like nineflowers and grimma, I have cause to be very grateful to the fundamentalists I met who helped me on the road to atheism. There were a lot of them! (The one incident that was the clincher for me leaving the church was when I brought a friend with me, who happened to have severe learning difficulties. One of the senior people in the church said that they "couldn't stop" him coming to church, but he wasn't to come and eat with us afterwards, because she "couldn't stand watching those people" eat. The pastor told me I was being over-sensitive about that, and that she had a right to her opinion.)
The other thing was that when I left that cult church, I was ostracised, completely. And since they had spent the previous couple of years making sure I was isolated from old friends and family, I had a long lonely road back to rationalism! Good way of keeping people in the fold though, making the alternative losing everything.
I can say now that I never believed in god. I professed to, when I was confirmed at 10, but I didn't. I didn't when I was going to that church. I had a god-shaped hole in my psyche, and I was trying to find things to fill it.