Yes, it's tricky. We can't support sin and if what they do is sinful, we can't support that. As for their refusal to accept Christ, that's God's to deal with. He has a plan and it's not our place to interfere with that.
Over the last 2000 years, the RCC has brutalized Jews and they will pay dearly for that. Some protestant churches have done the same, the Church of England in particular.
You should investigate RCC teaching on the Jews and the history.
I don't believe current Judaism constitutes God's current chosen people. They were in the OT, but the New fulfilled the Old, and that fulfillment is that people of all nations constitute "God's people".
Personally, I'm not "anti-Jewish". I think the problems Christendom faced with them in the past should be dealt with legislatively in laws that apply to everyone. Of course, if anyone thinks that would look like "FREEDOM" or "MY RIGHTZ" or what the current American legal landscape looks like, they are *way* off base.
