I don’t have any educated answers, but I’m Jewish by birth on my mother’s side. And I asked her about this when I was young. My mother said “her people” (her religious community growing up), had great respect for Jesus as a holy man with an command of the religion, an inspired moral code, and great charism. But they attributed his miracles to “magic” and just couldn’t buy that he rose from the dead. So he was born a Jew, died a Jew and his followers turned his moral code into a new religion.
My mother always respected Christians, most particular Catholics as they were the closest to the Jewish faith in so many areas. She had three best friends - all Catholic. She studied the faith, and she read the NT. She dated my Dad, who was a devoted Catholic and altar boy, and she sat in the back of the Church at Mass when he served. Then he went off to WWII and came back an atheist. I always wonder if he had returned as devout as he left if she might have converted???
But he came back not believing in God, and my mother brought us up loosely (very loosely) Jewish. But she respected Christians, especially Catholics and brought us up to find our own God and way in the world. She probably bought more Mass cards than many Catholics! But she just couldn’t get herself to believe that Jesus was the Messiah. Much of the time, she had trouble even believing in God due to all the tragedy in life.
I didn’t believe a word of it either until I was positively grabbed by the Lord.
Faith is a gift - some get it some don’t. I don’t know why.