In his two books, “The Occult Underground: The Dawn of the New Age” and “The Occult Establishment,” historian James Webb chronicles the rise of an occult intelligentsia as it emerged out of the Renaissance. Webb sees the Renaissance as a spiritually traumatic time in which the spiritual roots of many people were shaken free of Christianity. As a result, they eagerly embraced the pantheistic /materialistic occult traditions — Hermeticism, Theosophy, Buddhism, esoteric Cabbalism, alchemy, neo-Platonism, Gnosticism, and spiritism — sweeping into Christendom at that time. His book, “The Occult Underground” was originally called “The Flight from Reason” because Western man...