...Which would then lead him to the question of why he is not similarly vocal of condemning the various American, Serb, and Russian posters for their "pagan" EO beliefs.
A valid point in one sense... I would agree that the Catholic Church has no monopoly on pagan influence in worship. I would not limit it to Orthodox flavors, though. Someone else mentioned Christmas, which is certainly not limited to RCC or EO... Not to mention the concept of Christian Sabbath.
But as to why the RCC seems to get more attention in this regard, has to do (I think) with Revelations. True or not, many believe that there is scripture specifically addressing the RCC in Revelations. This is not just an anti-catholic doctrine:
“The Church here in Babylon, united with you by God’s election, sends you her greeting, and so does my son, Mark” (1 Pet. 5:13, Knox). Babylon is a code-word for Rome. It is used that way six times in the last book of the Bible and in extra-biblical works... Eusebius Pamphilius, in The Chronicle, composed about A.D. 303, noted that “It is said that Peter’s first epistle, in which he makes mention of Mark, was composed at Rome itself; and that he himself indicates this, referring to the city figuratively as Babylon.”
[Source for above quotes: Catholic Answers] (actually I copied the quote and the source from another post)
The inconsistency of the Protestant "big tent" idea (where everybody has a home - so long as you aren't Catholic) as it is interpretted by anti-Catholics is intellectually dishonest at the best of times.
I know there are a lot of people who believe the above. I know there are a lot of "Protestants" who do not believe that. I would certainly consider the "big tent" idea to seem contradictory to many scriptures.