Why is that absurd?
How do you know he's really a Christian?
For a zealot who plays the ‘who is REALLY a Christian and who do I want to send to HELL!’ I suppose it isn't absurd at all to claim that the Pope is not a Christian and is going to Hell.
But for most REASONABLE people, it sounds absurd on its face that a man who devoted his life to the Church and to Biblical scholarship, isn't a “real” Christian.
But you see I don't play those ‘who is REALLY a Christian’ games. Thus your confusion when I was speaking about the history of Christianity.
When I speak of the ancient world where for over a thousand years the vast majority of Christians were either Roman or Byzantine Catholic, I am NOT speaking of who were necessarily a “good” Christian or who was “really” a Christian; I am speaking of the people who identified as Christian.
When I say that America is some 70-80% Christian, do you truly believe I am making a statement as to the state of their salvation or what they truly hold in their hearts (which none but God and they could know)?
And did you think for a single second about the absurdity of your argument? I point out that through most of the Christian era the vast majority of Christians were either Byzantine or Roman Catholic - and your refutation of that is ‘how do i know if they are REALLY Christian?’????
Uh, because we are counting people who when you ask them say they are Christian; unlike you I don't have a “go to hellometer” that I gleefully apply to any creeds whose theology I find objectionable.