Like most of the "fathers", sometimes he was right and sometimes he was wrong.
"If I do nothing else this thread I'm not going let this unmitigated lie masquerade as a historical fact. If you make a claim like this you back it up with primary sources."
If your truth claim is that it is a lie, prove it. Go to the entire book Calvin wrote - linked in the article - and go to his sources.
"When exactly was paganism incorporated? I want dates. I want names. I want places. I want 4th century authors who describe this process at work. "
Do you want to be spoon-fed too? Go to the primary source quoted and read.
So why in Sam Hill do I have to read Calvin quoting the Fathers, when I can read the Fathers themselves? What could a guy born in 1509 add to the discussion except his own opinion?
I reiterate: if this pagan corruption happened in the 300s, find me someone who was there and saw it happen.