While the rest of your post is a clear example of how utterly vile Christianity can be and a significant reason why I could never accept Christianity as a personal faith, I wholeheartedly agree with the statement above. Judaism and Christianity are polar opposites. And since Christianity is the dominant faith -- the supercessionist faith -- adopting, changing, usurping and erasing the Jewish rituals and their meaning is dangerous to the Jewish people.
Nobody is changing their rituals, but their rituals should be SEPARATE and NO Christian who accepts Jesus Christ as The Messiah should NOT participate in them, they do NOT participate in ANY Christian ritual including the total rejection of ALL Christian Festivals and Holy Days. I add that I also totally REJECT any participation in any Islamic Festivals, so I am not about to participate in Judaisms Festivals am I?
As a majority of Jews are Athiest and Secular, as a Christian why am I expected to follow them and listen to them and agree with them when they represent EVERYTHING that as a Christian I am against and I feel that any Christian following these Athiest Secular Jews is a danger to that person's soul.
So you say that Christianity is a danger to the Jews and I say yes but the same the other way Athiest and Secular Jews are a danger to Christians, considering for one thing to agree with them in total we would have to agree with them, in the rejection of Jesus Christ as The Messiah, I do not want to condemn my soul to Hell, others make that decision for themselves and I pray for them to see The Light and I wish them luck.