I left the Christian fold mainly because I began to doubt the reliability of the Genesis creation accounts in the face of the age of the universe. Hector Avalos and Robert Price left it because of biblical criticism, both OT and NT respectively. Exapologist left it because of the failed prediction that Jesus was to return in his generation. Ken Pulliam left it because there was no cogent explanation of the atonement. William Dever left it because of biblical archaeology. Bart Ehrman left it because of the problem of suffering. My claim is that people leave the fold for so many different reasons because there are so many different reasons to do so. What other former Christian authors/scholars do you know and why did they leave the fold? Why did you?