Why is antizionism confused or assumed to also be antisemitism?

Even the word antisemitism seems to have been hijacked to purely mean being against a particular religious belief system.

It seems to me that religious beliefs are something that should remain private. Making political policy based on religious doctrine should not exist. None of it is based on any shred of evidence anyway. Controling people with fake emotional naratives of ethnic superiority seems to be wrong.

Just my rambling thoughts at 4:00 AM.