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The language you used implies they don’t care about the argument and that the lack of care is what counteracts an argument instead of facts.

I only threw in that line as counter to their closing sentence of "stop helping the Christians appropriate my culture." I find it hard to believe that this supposed Christian appropriation actually bothers them very much if they themselves default to the Christian terminology. If you insist on calling my argument an appeal to emotion, then I will insist that I was only countering their prior appeal to emotion.

Perpetuating the “Judaism is unnecessary now” narrative is part of what breeds antisemitism and makes for more hate crimes.

By that same logic, every single religion in the world perpetuates hate crimes against every single other religion. The Judaism/Christianity relationship isn't special because literally every religion that isn't Judaism inherently includes the idea that Judaism is unnecessary. Just the same as how Judaism inherently includes the belief that every religion except Judaism is unnecessary.

Why not demand that Exodus be called Shemot?

Because prior to this interaction, I (a Christian) have no recollection of ever hearing the term Shemot before. If they had called it Shemot that would've been even better. But as it stands, the term Torah is very basic in the context of understanding Jewish terminology

Sure it’s something that Christians learn about, but it’s not something seen as Holy as it is in Judaism. The vast majority of Christians do not really celebrate Passover, just as Jews don’t celebrate Christ or Christmas.

That all comes down to the difference in their views of Christ. If you believe that Christ was not the messiah, then you have no real reason to celebrate him. If you do believe that Christ was the messiah, then you have incentive to celebrate important events in his life and less incentive to celebrate the feasts which were only instituted in order to point to him.

Why would I celebrate the passover, a feast that points to the sacrifice of the coming messiah, when I could just celebrate the life of that messiah instead.

I think the best comparison I can think of is something like world war 2. We don't celebrate D day, or the battle fo the bulge, or the battle of Midway. Because instead we can celebrate remembrance day. Why celebrate every major battle when you could celebrate them all at once in the winning of the war?

Or if you're Jewish, you celebrate those battles because you don't believe the war is over yet.