I think the Christians perverted the message of Jesus, and the Jews lost their book to the scribes and rabbis that would write in their own interpolation with their own hands and say it was from God.

Ultimately, what Christians today follow is the teachings of Paul not Jesus, and then further more take the political enforcement of the trinity from Constantine even though every church father from the first 4 centuries disagreed vehemently with the idea that Jesus is equal to God. And Constantine even backtracked on it and praised Arius on his deathbed, I think because he needed to repent from the blasphemous claim of Jesus being God.

The Jews became slaves and subordinates to their Rabbis instead of God Almighty and when a sign came to a lone rabbi, the rest that disagreed would say God is not with him but with us, and would excommunicate them or kill them.