Obviously there is illusion and deception by those who profit from these things. However, is there also evidence of reality in occult ritual or is it all merely illusionary? I've been reading John Warwick Montgomery's Principalities and Powers. His has credentials as a Christian apologist (of the evidential stripe) and thinks that there is reality at some times, in some cases. A scriptural related question is whether the Egyptian magicians actually did what they seemed to do or if it was illusory and deceptive.