“The first band were those who took the part of Xipe Totec and went dressed in the skins of the war prisoners who were killed the previous day, so the fresh blood was still flowing.”
—Xipe Totec, “Our Lord the Flayed One”, god of agriculture
That's one polyvalent god: agriculture, spring, metallurgy and war to name a few. In the context of skin wearing, the god of war role might be more relevant.
the skin wearing was a representation of the husk of corn
the “god of war” was more adjacent – the “formal” god of war was Huitzilopochtli, “Hummingbird on the Left” (Aztec saw the hummingbird as a blood drinker)
There were several things other than that one form of human sacrifice. They would hold feasts & festivals, offer flowers & dough men made from amaranth, pray at midnight, create paper ornaments, burn copal, sing & dance, and would clean & maintain temples to show their devotion.