Losing Our Faith: Why Are More Americans Doubting the Existence of God? (Psychology Today)

"...In my own study of apostates (people who were once religious but then rejected their religion), I interviewed many people who once believed, then seriously thought about the content and nature of that belief – and realized it didn’t add up..."
https://www.psychologytoday.com/blog/the-secular-life/201608/losing-our-faith