I think it is widely accepted that the Virgin Birth, the Bride and Bridegroom, and the resurrection of the young Lord are all pre-Christian motifs. Judaism had bread in their ceremonies, but even drinking wine was banned for certain types of their worship; drinking or eating blood was prohibited. I'm not sure which of my posts you are objecting to. This page puts Persian Mithraism at Tarsus in Paul's time and says he was catering to the 'Gentiles' there by incorporating elements of that religion such as drinking blood (http://jdstone.org/cr/files/paulandthepaganreligionofmithraism.html). Others dispute this point. Mithra's birthday was celebrated December 25. I've never heard of Jews 'imprinting' their bread with pictures, certainly not designs prohibited by their First Commandment against graven images. Whereas Jeremiah 44 clearly records imprinting on the Pagan bread. Maybe the bread and wine were already familiar to Pagans as these were whom Paul preached to, but who knows for sure?