> Scientologists don't have a nation

It's confusing because "Jewish" has both a religious and ethnic meaning depending on the context, while "Scientologist" would generally only have a religious meaning. This distinction is the source of a lot of confusion.

> they don't have a right to go genocide indigenous people to make one

I don't think anyone here is arguing that any group has the right to genocide any other group of people to create a new state, that is a straw man argument.

The actual arguments would be that war is not a genocide in addition to the fact that Jews are historically indigenous to the region. Israel also already exists so this isn't a matter of making a new state.