For though there be (kai gar eiper eisi). Literally, “For even if indeed there are” (a concessive clause, condition of first class, assumed to be true for argument’s sake).
Called gods (legomenoi theoi). So-called gods, reputed gods. Paul denied really the existence of these so-called gods and held that those who worshipped idols (non-entities) in reality worshipped demons or evil spirits, agents of Satan (1Co 10:19-21).