Where does “antideus” come from?

antideus (Portuguese) comes from Portuguese Deus, from Old Portuguese Deus, from Latin Deus, from Latin dẹ̄vos, from Old Latin deivos, from Proto-Italic deiwos, from Proto-Indo-European deywós, from Proto-Indo-European dyew- — to be bright; sky, heaven.

antideus (Portuguese): antigod