Why the difference? Jews can't get legally married in Indonesia. Marriage in Indonesia is effectively limited to Muslims, Catholics, Protestants, Buddhists, and Hindus. If you are Jewish, or Orthodox Christian, or pagan, or atheist, tough luck....
Also it may be practically illegal to be Jewish in Saudi Arabia (I don't know about Sabbateans, which is a sort of weird crypto-Jewish Islamic hybrid that resulted after some forced conversions).
Who says that they won't run a campaign for that? That line of reasoning seems really strange to me. How do you ever manage to do anything, if all the time you think "but why not do x instead"? You have to start with something.
Were they to run a campaign against antisemitism, you would be the first to cry out "why don't they run a campaign for gay marriage instead".
Sure, why not. I am sure they could campaign for acceptance for eating cheeseburgers among the Jews too while they are at it. But that wasn't the point I was replying to.
Also in Indonesia, allowing same-sex marriage by law but keeping all the other marriage laws would change... exactly nothing. All marriages in Indonesia are required to be officiated by clergy of approved religions, and the approved religions are, iirc, fixed in the Constitution.
Also it may be practically illegal to be Jewish in Saudi Arabia (I don't know about Sabbateans, which is a sort of weird crypto-Jewish Islamic hybrid that resulted after some forced conversions).