However, since you think it’s okay to speak down to fellow Christians then it seems to me that the Greeks would be most likely to have Christianity the most correct since the scriptures were ultimately written in Greek and not Latin. This is only one reason.
I hear similar statements all of the time including here on FR on some of the religion threads (but of course in many denominations the term "bishop" is not generally used.) The position among some protestants that Catholics are superstitious and not even Christian is all too common.