I've watched closely and I believe most people who turn from God do so for one of two basic reasons. One, they mistake some aspect of religion as God (like Anton LaVey did). Or two, they are unable to overcome their need to understand what can not be understood. I honestly don't think it's easy to turn from God if we see Him as He really is. Every Satanist I've ever encountered has fallen into one of those two categories. They either have a warped, distorted perception of God, based on what they were taught by some idiot, or they don't believe in the goodness or even the existence of God because of the injustice of the world. The first is a problem of perception. The second is a problem of pride. Both are hard to get past.

Open Letter To Satanists