Temples and Culture

Hi, im playing as Seleucia and i have all of Asia, Most of Africa, Greece, and i am pushing into Europe. I took the italian peninsula but am having a hard time holding it due to culture penalties. They are all large cites with high level temples. As of now i just leave whatever temple is there.

Would it make any difference if i demolish their temples and build my own, if in fact that does work, im going to reform my entire empire and demolish all temples and rebuild seleucid law giving temples cause corruption is getting ridiculous.

Ive tried leaving a mediocre army in italy, put taxes on high to make cities revolt one by one. Then take the army and exterminate the settlement as many times as needed. I brought Romes 30,000 population to 4,000. My impression is all new citizens are going to be more Greekish, is that true? Would destroying other roman culture buildings like their games and races etc and build my own theatres and such reduce the roman culture and speed up my greek culture? thanks

Culture is determined by the faction who created the buildings that are present, most effect from the governor's palace. The temple does not have more effect on culture than other buildings like taverns, roads or government, but of course it will usually give some public order bonuses that you may have problems going without.

So if im the seleucids does it make much culture difference if i have persian or indian temples in my cities? Does it make sense to make all my temples greek? Because i know that sometimes there are "equivalent" temples.

Yes, it makes sense to make the temples greek, much as it makes sense to make the other buildings greek. The higher amount of buildings that you have created, the higher portion of your culture in that settlement.