They marry non-jews, but force Jewishness upon the children, therefore maximising their birthrate. They basically usurp non-jews for breeding Jews.

Even a genetic gentile raised in the spirit of Talmud is going to grow up to be a regular talmudic Jewish supremacist, they are going to live according to the talmudic principles, which allow and encourage Jews to scam, rob, enslave and kill the goyim.