The Jєωιѕн people have a religion and a history that is even longer then ours. We even have their holy book included in ours. We have no right to say that their religion is not real any more then they have a right to bash ours.
Judaism has little to nothing in common with the OT religion of the Israelites. It is, in fact, the nullification thereof.
Jesus celebrated the OT rites because the OT was STILL VALID. Clinging to such 2000 years after the train has left the station is hardly laudable. As an important aside, the beliefs and practices of Judaism bear NO RESEMBLANCE to the beliefs and practices of OT Jews.
They have been persecuted because they FAILED to live up to their God-given vocation. It is like the mess that a man becomes when he fails to answer the call to become a priest. If he repents and returns to the appointed road, he will be fine. If not, NOTHING will EVER work.