The 'Religious Reich' is a synonym for the Religious Right. The Religious Reich favor the death penalty and are against abortion. Generally regarded by the sophisticated as puritanical zealots, the Religious Reich would virtually erase all social advancements made by women, gays and lesbians over the last 100 years.
Did you hear about that nut from the Religious Reich shooting the Abortion Clinic nurse in the face?
Not content to refer to those who disagree with them as the "Religious Right" or "Christian Right", some moonbats demonize their adversaries further by referring to them as the "Religious Reich".
As far as I can tell, Isaac Bonewits was the one who coined the term 'Religious Reich'.