While all true disciples are theologians, not all theologians are true disciples. If knowing the Bible and understanding theology were reliable measures of discipleship, Satan would be the greatest disciple ever. After all, his knowledge of Scripture is exceptional and he’s been observing the spiritual realm for quite a long time.
Greg Dutcher, Killing Calvinism
Life Is Worship 
That is an interesting idea. I never thought of that.
I think it was Warren Wiersbe who said something to the effect that believing in God only qualified one to be a demon, based on James 2.19. Unfortunately, the demons know God’s Word better than many believers. Even Satan himself questioned Eve in the Garden of Eden, “Has God not said…”