God may or may not exist, but the experience of God is undoubtedly real. The human nervous system can produce all the necessary mystical effects—the rays of light, the shining face, the booming voice. At the same time, the brain can generate a sense of reality and total certainty, like pounding drums accompanying a guitar.
The result is a complete and compelling experience of the divine. Nothing supernatural required. No questions asked.
What’s more, a mystical experience can produce real-world results. Suppose that a wicked person hears the voice of God say “Clean up your act!” The wicked person might find hope and be less fearful and more loving. Does it matter whether God’s voice originated in heaven or in the electrical activity of the brain? What more would a real God have to do?
Since we all have the same nervous system, anybody can have this kind of spiritual experience—atheist, believer, whatever. There’s no reason why an atheist couldn’t have a lifelong relationship with the divine and go on being an atheist.
In fact, skeptics might be better equipped for mysticism. They can’t deny the reality of the experience, but they’re always on the lookout for bullshit. The voice of God may say “You are loved” in one breath and “Beware of men who wear red pants” with the next. Regardless of what God says, your brain cranks up the pounding drums of reality and certainty. Without skepticism, you’re screwed.
Fortunately, we’re all natural skeptics just like we’re all natural mystics. Perhaps both are necessary for a full human life.