They are not Israel anymore, they abandoned the Path to God. They are virtual apostates. They deny and reject Jesus AND the Holy Spirit. As you know rejecting the Holy Spirit is the unforgivable sin. Yet, each one of them can be born again through baptism. God does not want us to support the wayward. St. Paul says to shun the disbeliever (after attempts to correct them). Shake the dust from your sandals.
There is a reason Pentecost happened on Mount Zion, because WE ARE ZION. Three thousand were converted that day on Mount Zion. All the baptized constitute Israel/Zion. Those first three-thousand are the start of the New Exodus in Christ.
All the Christians left Jerusalem by 70AD, they were saved and the old destroyed.
God commands that we support Christendom.
I’ve rarely seen anyone but a Moslem be such a raving antisemite. I would guess a Philistininian who subscribes to some branch of Christianity. If you had the Holy Spirit you would love Israel and the Jews in the Diaspora. Do you recall what happened to Balaam and Haman ?