For non-Catholic Christians it was pretty good. There was a bit of discrimination against them, but for the most part they could fully participate in crusader society. For Jews and Muslims it was not so good - the best case scenario was that the crusaders simply ignored them. They had fewer rights and opportunities in society. Worst case scenario, they could be enslaved or attacked/killed. I have some previous answers that go into much more detail:

What was the social standing of oriental christians in the crusader states of the levant?

as well as another post about minorities in the crusader states that is more about the Muslim side.