Supporting Israel for many hardline Christians is a means to an end - it’s a step of fulfilling what they interpret to be biblical prophecy. They don’t actually give two shits about Jewish people, they care about Israelis.

They also believe that when the Rapture comes all Jews will either instantly convert to Christianity or burn in hell so yea, definitely an odd flex supporting Israel for the most anti-Jewish reason possible. They are called Evangelicals (so you don't confuse them with other fascist Christians).