You can and absolutely should call them out. You can call them fake Christians if you want I guess, but that’s not really calling them out, it’s clear you’re just saying it to make yourself look better. No matter what your take on them is, I know for a fact that they’re Christian, and you trying to cut them off from yourself like that just makes me think you’re a lot closer to them than you’re letting on. I can hardly think of any times I’ve seen Muslims deny that the Taliban are real Muslims, or Jews deny that zionists are real Jews. Why is it so hard for Christians to do the same?