Christians who support Israel are just useful idiots for Judaism.
I agree.
Modern Christianity is no better than Judaism. Both are horrible. Both hate free speech. This is why I support Islam.
Islam doesn't hate free speech?
But I don't have any advice for white nationalists, they seem like a lost cause to me precisely because they don't have a reasonable religion to get behind.
Christianity seems like the best option. Traditional Western Christianity, not modern liberal cuckianity. Odinism is an interesting alternative. A new religion could be founded based on Homer's or Tolkien's epos.