Also, surely you would concede that scholars who sought to rediscover ancient greek/roman literature through a Christian lens in the 15th/16th centuries played a big role in making it accessible to the Christian world?
Of course sacrifices which was both a Judaic and typical polytheistic ritual was dropped from both Hebrew and Christian practice.
Oaths is another one, oaths are a very polytheistic tradition, you swear to do something with the gods as the arbiter and the judge of you actions. I don't believe Hebrew tradition is very big on taking oaths, I think they actually forbid it, I may be wrong.
As another example the Pope is a pontiff, that is a roman religious office predating Christianity.
Point is when Christianity spread in the empire it evolved to include a lot of the religious practice of the people of the empire.
Typically in a Greek sacrifice a food item I think typically some sort of animal protein was dedicated to the gods cooked on site and then split amongst the attendees, the gods are satisfied with the smoke as far as I understand.
Holy communion has very similar mechanics, food item then a ritual involving god, and then communally consumed.
Well, the very strong devotion to saints IMO comes from a polytheistic approach rather than a monotheistic one, where you just have an invisible god you are not even permitted to draw or paint.