Roman Catholicism has added much to that. They’ve departed from Scripture on many topics. That’s how you can evaluate the legitimacy of an organization and their beliefs: do they square with the Bible.
As an example: Rome allows, and even encourages, the wearing of an idol known as the Scapular. An apparition gave this back in 1215 and promised those wearing it would avoid the hell fire. But there are stipulations on this idol for it to “work”. That’s a sure sign of a false organization that allows that.
. So yes, we can evaluate the legitimacy of a belief system.
Obviously, you are very hard-pressed in your position- no matter how many times you have been corrected.
God doesn’t save religions or institutions; He doesn’t condemn memberships and associations. Instead, he saves individuals based on their faith in His Son - just as you testify.
I know you like to have the last word, so here’s your chance: