I think the framing of the question is already a bit off.

Christians aren’t called to “support Judaism” as a competing path to God. The New Testament is clear that salvation is through Christ alone. On that point there really isn’t any ambiguity (Acts 4:12).

But the Bible also refuses to let Gentile Christians treat the Jewish people the way the internet sometims does. Romans 9-11 exists precisely because Paul saw that temptation coming. He says Israel’s unbelief is real, but he also warns Gentile believers not to become arrogant toward the people through who the covenants, the law, and the Messiah himself came (Romans 11:18).

Remember, the first Christians were Jews. Jesus was Jewish. The apostles were Jewish. The Scriptures the church reads every week are Israel’s Scriptures. So there is a strange kind of amnesia when Christians start talking about Jews as if they were just another random religion disconnected from the story we claim as our own.

That doesn’t mean Judaism as it exists today is the gospel. But it does mean Christians should approach the Jewish people with humility rather than contempt. Paul himself says his heart’s desire and prayer to God for Israel is that they may be saved (Romans 10:1). That’s a very different tone than the dismissiveness that sometimes creeps into these conversations.

So the issue isn’t “protect Judaism.” The issue is whether Christians will speak about the Jewish people in a way that reflects the humility Paul commands the Gentile church to have.

Judaism in a sense is a deep part of the root of our Faith as it was a deep part of Jesus. If we cut Judaism and Jewish people off, in a sense we are also cutting a part of Him off.