Jesus was a Messianic Orthodox Jewish believer. This is why he quoted the Sh'ma. No Orthodox Jewish believer, then or now, accepts a Trinity teaching. Jesus was an Orthodox Jew who believed that he was the Moshiach or Messiah, as did his disciples. Believing that Jesus was the Messiah did not change their basic beliefs in Orthodox Jewry. He was the Son of God, not God. The teaching of a trinity god is blasphemous to Orthodox Jews and a reason why they do not accept the Gentile church version of Jesus Christ.
When the persecution of Messianic Jewish Christians occurred along with the destruction of the Jewish polity in 70 C.E., the church became predominantly Gentile. They rejected the godhead of the Orthodox Jewish believers and instead infused the Logos teachings of Greek philosophers from five centuries before, revived by Philo, along with other elements of Greek metaphysics, paganism, and Gnostic interpretation and developed the modern teaching of the Trinity.
Interestingly, at the Council of Nicea, the Trinitarian faction made many kinds of parliamentary maneuvers to convince the Emperor Constantine to side with them. Previously, they had been outnumbered by the Arian Christians who kept some semblance of the belief of the Orthodox Jews regarding the One God as taught by the Sh'ma. Athanasius,
the leader of the Trinitarians, was a sociopath and even murdered Arians for political influence and prestige.
Constantine saw his mistake and became an Arian again, but it was too late for the "Universal" church. The church became a persecutor of Arian Christians and banished, imprisoned, confiscated their assets, and even killed them.
So it would be today if they had the temporal power.