YOU can. And whoever "we" is but I am not in that group.
Bottom Line: (once again) YOU and your "We" crowd can judge someone's position all you want but your judgement may or may not be what you see when you are at the Seat of Judgement for yourselves. Being a Catholic doesn't mean you're lost. It just simply doesn't. Are you saved (if so) because you attend some religious institution?
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.