There are naturalistic explanations for religious visions, and no, they don’t all mean you’re crazy. (Check out Oliver Sacks on Hildegard of Bingen, and Robert Sapolsky on St. Paul.)
I’d also recommend Why God Won’t Go Away: Brain Science and the Biology of Belief by Gene D’Aquili and Vince Rauss.
I’d also recommend Why God Won’t Go Away: Brain Science and the Biology of Belief by Gene D’Aquili and Vince Rauss.