In my hyper religious, Southern Baptist upbringing, I often heard Christians say that Christianity is not a religion. The mental gymnastics employed to explain this position were varied. Most often it was “Christianity isn’t a religion, it’s a relationship [with God]”, or something along the lines of “Christianity isn’t a religion because it’s true”.

“Religion” in general was thus deemed a bad thing, because it was a term used to encapsulate all the other (and thus false) faith-belief-philosophy systems that were used by Satan to lead the world away from God. It bears noting that Catholicism and other major denominations always all fell under that umbrella of “other”.