Hello Revealing
You are Right Zeus is Baal and Satan's throne was at Pergamum. You are not understand the whole picture. You have some of the pieces but you have yet to put them together.
Please allow me to give you some more pieces.
Who is the warning of Revelation addressed to?
Pergamum was a Church in Asia Minor {Of course}. He was speaking to Seven Churches who were a type of the Church Age, not Church periods IMHO, but the whole Church Age who no doubt has had these types of Churches for 2000 some odd years.
Rev. 2:13 I know
thy works, and where thou dwellest, even where Satan's seat is: and thou holdest fast my name, and hast not denied my faith, even in those days wherein Antipas was my faithful martyr, who was slain among you, where Satan dwelleth.
14 But I have a few things against thee, because thou hast there them that hold the doctrine of Balaam, who taught Balac to cast a stumblingblock before the children of Israel, to eat things sacrificed unto idols, and to commit fornication.
I know your WORKS or the Fruit of the Spirit that ascends to my nostrils in Heaven. AND, I also know that you dwell where a Temple of Zeus has been built, where they worship at the altar of Ba'al, or Satan himself. BUT.....I have a few things against you........you have invited in people with bad doctrine, they eat things sacrificed to idols and they thus commit fornication [to strange gods] etc.
We have those types of Churches in America/World now. They actually celebrate Halloween, they allow gay marriages and gay preachers/priests etc. etc. They love the world and celebrate worldly things, when Jesus tells us if we love this world the love of God is not in us. To love this world is enmity against God !!
It's not really that complicated, I think a lot of people overcomplicate these things.
God Bless.
P.S. That Altar to Satan is the real Altar put back together piece by piece in Berlin.