someone: The Roman gods are just taken from the Greeks wholesale
me: Actually, the gods we know as the Roman gods existed for at least several centuries—-and likely longer—-before their Greek equivalents were superimposed over them. Take for example Mars, who was not just a god of war, but also agriculture. In edition, he was extremely important to the pre-Roman Italians, being second to Jupiter and being an integral member of the Archaic Triad, alongside Jupiter and Quirinus. He even has a Roman-only consort in Nerio, or “Valor”, and his relationship with Venus came much later.