All those ethnicities have equal legal rights, right?

Yes.

If I’m gay, can I get married in Israel?

Yes. It’s illegal to be gay in Gaza.

Did the multiculturalism extend to the Gazan Jewish or Christian populations (you know, the Jewish ancestors of the people that DIDN’T leave in the diaspora)?

Yes, assuming you’re still talking about when/where Israel was in charge.

Did it extend to their places of worship?

Using the past tense? Not in Gaza, but yes in Israel.

Do I need to continue? You’re obviously ignorant