 When you scan the brains of believers, you find that their understanding of God is nonverbal, more akin to a feeling or experience than a set of ideas. This is why Christians are usually stumped if someone asks them, what is God? Contrary to what some skeptics say, it's not because these people's belief system is unsophisticated or simplistic. Instead, it's that their experiences with God aren't primarily associated with the language centers of the brain. Trying to describe God is a lot like trying to describe falling in love, and that's a serious problem for people who doubt that God is real. It's also why Christian apologists have such a difficult time reaching those who don't believe. While believers, when asked to focus on God, demonstrate a rich, elaborate neural construct. Atheists presented with the same requests show neurological fizzle. The unbelieving brain has no God construct, no neurological model for processing spiritual ideas and experiences in a way that feels real. This is why Bible stories and arguments for God's existence will always sound like nonsense to a skeptic. For the unbeliever, God is truly absent from his or her brain.