different groups of people that often are not even connected to each other

Christianity is the most populous religion of the world with a long-defined history of defining itself in contrast to the other Abrahamic faith it split from.

I am not advocating for antisemitism

Advocating for downplaying the long-documented history of antisemitism indirectly advocates for antisemitism. It’s not like this is a niche prejudice; it wouldn’t be hard to learn about the causes and sources.