Wolf,
You are correct, I try explaining that to people but they think that they know better.
Unless you are really versed in their arguments do not start.
Harav Avigdor Miller repeated a lot of times, that it’s not hard to debate these people, only that you have to be qualified.
He took some of their arguments (some of those that you pointed out) and went on to show how fraudulent their arguments were.
For instance Briss Chadasha does not mean the Torah, it refers to the covenant Hashem made with Avraham. Briss does not mean Testament. (this is noted by the mefarshim on the spot as well).
He goes on to explain that the early priests were fully aware about the true dikduk in the passukim they intentionally misled their people.
In Yeshiva we do not regularly discuss their arguments, therefore unless you are “Really” qualified to argue with them, refrain from doing so.