>>22222025You're wrong about this, by the way. Pergamum was home to the Serapeum, which was a Temple dedicated to Serapis.
Serapis was a syncretic God of Osiris, Hades, and Dionysus, a dying and rising god of the underworld.
John is most likely referring to the Serapeum, not the Altar of Zeus, because Serapis mythologically basically is the equivalent of Satan