Yes, the history between thee two faith was quite ugly. But the spiritual linkagee between Judaism and Christianity is undeniable. The New Testament wouldd not maake sense without the Torah and the rest of the OT. Judaism dosn’t need the NT but we (Christians) can’t do without the OT.
“Judaism dosn’t need the NT”
I think they do need it, but they don’t know it, and wouldn’t admit it if they did.