Fraggle Rocker: The mapping of Greek gods to Roman gods is not surprising. The Romans were militant conquerors who were smart enough to recognize that the Greeks had more culture, knowledge, science, mathematics, literature, et cetera. The children of many wealthy Romans were educated by Greek captives/slaves.
I was unaware of a mapping between Greek & Egyptian gods. The Greek gods were portrayed as very similar to humans. I thought that some of the Egyptian gods had animal or bird heads on a human-like body.
I suppose that all of the ancient religions had a sun god & other gods associated with natural phenomena. This does not seem like the almost one-to-one mapping of Greek to Roman gods.
BTW: Dumb joke. The Egyptians invented modern cheer leading.