You don't seem to understand a lot about history with regards to Jews. Someone can consider themself to be a Jew if they are in the Judaism religion, and they can consider themself a Jew If one or both of their parents are Jews. Sometimes people that don't consider themself to be a Jew can be considered a Jew by others even if just one of their Grandparents were a Jew.
All of these have been oppressed in the past. Oppression of Jews generally goes in cycles. Tolerance for a few generations, but then animosity builds up over time. Since Jews are a minority group they're an easy target, and if a minority group achieves any measure of success people become jealous and a minority group having success runs counter to white supremacist ideology. Paranoia builds up, lots of conspiracy theories around Jews being successful because they used manipulation and took things that rightfully belonged to someone else.
Then a massacre happens and most people are horrified by it. So the majority of people go back to tolerating Jews again. But after a few generations people go back to the paranoia and jealous hatred against a minority group for achieving any kind of success.
The last cycle when antisemitism reached it's maximum, there were no countries that offered sanctuary to Jews. I don't think that will be the case on this cycle because while there's few people left who personally witnessed the holocaust, most people in positions of power at least knew someone who was affected by it. But on the next cycle? What happens if the people that say October 7 was justified are the majority and are in positions of power in the west? The tankie pro-Palestinian protest kids of todady will likely be the MAGAs of tomorrow. It's easy to see the potential of repeat of every country in the world refusing to offer sanctuary to Jews that are the victims of oppression.
And that's why Israel exists. It's not a religious state. It's also not an ethno-state. It's a state that exists to provide sanctuary for victims of antisemitism. A lot of people are uncomfortable with the existence of Israel because it's a reminder of our failure to have any level of humanity towards Jews in the past.
I hope there's a day where it isn't necessary for there to be a country that has a Jewish majority to ensure there's at least one country that offers sanctuary to Jews during times of peak antisemitism. But seeing attacks on synagogues and attacks on Jewish businesses in the west, we're unfortunately not there yet.
