How does the art of this period represent a change from a human model of God in Ancient Greek and Roman cultures to a symbolic model?

Answer:
In art religion has always had symbols.

In the modern day it's blood, the cross, and a man with a halo over his head.

In the ancient Greek and Roman religion, for Zeus/Jupiter it was the eagle, lightning, and Olympus. The other gods and goddesses also had their symbols.
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