According to anthropologists, religion arose in the Neolithic period, a time that began 12 thousand years ago when people abandoned the hunter-gatherer lifestyle and started settling down in communities. By the time of the ancient Egyptians, religion had reached a significant level of development. The spirits of the seeds and the weather had evolved into gods. In the end, the gods numbered more than a thousand; every god required a temple, and every temple needed a priest, or several of them. Following the death of Jesus, for the Christian god to reach its final form took an additional three hundred years. It was accomplished through the work of dozens of bishops who wrestled with the problem of how a god consisting of three persons could really be one entity.

Religious orthodoxy as we know it today is the result of the countless solutions proposed by priests, not the result of divinely inspired texts or teachings, with various bishops condemning some proposals as heretical and blessing others as conventional. But how were orthodoxy and heresy distinguished? Any position that increased the power of the bishops was, by definition, orthodox, and any position that undermined it was heretical. Thus, the Christian god that we have today is a construct assembled over many years, and for two thousand years it has served to augment and solidify the power of the bishops who created it and who sustain it.

Religion, Power & Illusion concludes that priestly power is so firmly rooted in the human condition that religion is not likely to disappear any time soon. It also explores the defective logic used by religious promoters, and what is necessary for experiences to be non-illusory.