I'd argue that they're far more racist and Christian-Nationalist than they are anti-semitic, so killing brown muslims is more important than supporting a Jewish state. Also Israel is a Jewish Nationalist state, so it's analogous to the Nazi's allying with Japan — fascists ally with other fascists.
They need Israel to bring about the end times. The Jews themselves will all burn in hell, that is unless they convert to Christianity. That is conservative Christians end goal.
Many of these anti-semites love having Israel as a Jewish state. They imagine that it means there's someplace for them to send us American Jews off to when they take over. Nevermind that most American Jews were born in America, have never been to Israel, and don't want to go. The anti-semites think that's where we belong and they'll ship us all "back" there as soon as they can.
Western support for Israel has always been an antisemitic thing - Christian Zionism has always been based on the virulently antisemitic idea that Jewish people "do not belong" in "western civilization" and should be "sent back where they came from."
Virulent antisemitism and rabid support of Israel goes together like horse and carriage.
There's also the delayed anti-semitism of evangelical Christians. They think that Jesus will come back when a Jewish-controlled Israel suffers a huge attack. Then, as Jesus pulls them all to heaven, he'll toss all of us Jews into hell for all eternity. By "supporting Israel," the evangelicals think they are setting Jews up to burn in hell as soon as possible.
This is also why evangelicals are big supporters of groups like the settlers. After all, they need a big attack on Israel and peace in the region would reduce the chances of this happening. If they added a few gallons of gas to the raging fire there, though, they might be able to get things so bad that the "Jesus Returns Attack" happens.
It should be obvious, but it's like ole' Malcom X said - the purpose of the media is to make you love the oppressor and hate the oppressed. Nowhere is that more true than the brain-warping propaganda we have been fed in regards to Israel for decades.
If you take a look at all the countries that have always been in support of the very idea of Israel - Canada, the UK, Germany, France, Australia, Apartheid-era South Africa and, of course, the US - it becomes patently clear that the most rabidly pro-Israel countries are all countries with deep histories of white supremacism, antisemitism and, very importantly, colonialism.
It is no coincidence - the people who created Israel and runs it to this very day learned their "westernism" from the best in the genocidal colonialism business.