partly because of stuff in the bible and how jews were the only ones allowed to profit from lending money in the middle ages and how their religion allowed them to ask intrest from non-jews and then later because of small groups of jews amassing huge fortunes by lending money with intrest like the rotchilds

This is kind of an interesting one historically. My understanding is it goes back to minor scriptural differences with Christian practices. Essentially early Christians had a rule against usury or the practice of taking interest on lending. Jewish people of the same era had a similar rule, but it was interpreted at the time to only apply to lending within the faith.

Now with banking taking off as being a useful thing to have for business, Christians had a stigma against being lenders, so instead they legally enforced a code restricting Jewish people to essentially only being able to take those professions.

So a combination of preexisting antisemitism and cultural disdain for moneylending combined to force Jewish people to be the lenders, and then Christians grew to hate Jewish people more because of the situation they created.

I am sure someone more qualified than me will chime in, but from what I recall it had something to do with Christian law being strict on money lending, but it didnt apply to Jewish folk, https://en.wikipedia.org/wiki/Court_Jew?wprov=sfla1

It works because generally people are greedy and cheap, so you can paint pretty much anyone with that brush.