I can understand how both could assume it was a “Christian” posting, but it is a good practice to look up the OP when not familiar.
Yet in the past some RCs would join forces with an antagonistic atheist against us.
I have a pretty good idea which ones you are talking about. Many, as I remember, were on the subject of the deity of Jesus Christ, which, oddly enough, were on the side of those who claimed it was not taught in the Bible! Even now, few Catholics join in on threads where this is discussed to defend their OWN church's teachings. I don't get it.