The emergence of the idea that Jesus is God, rather than simply the Messiah, and the subsequent development of Trinitarianism runs hand in hand with anti-Semitism. After all, it's one thing if "the Jews" simply killed an important man; it's quite another if "the Jews" killed God.
VERY fortunately, that's been changed-- within the Catholic Church at least. I was sponsored on a study of the Holocaust back in 1991, thus I spent three weeks in Poland and Israel, and while in Poland we met with Catholic (and other) clergy there explaining what's been done since to ameliorate this.
Secondly, the issue of the Trinitarian concept had little to do with anti-Semitism, but what had a lot to do with it is the writings within the NT that actually encouraged it. Fortunately, within the Catholic Church at least, it is now recognized that the NT was written with such an unfortunate bias, which is why recent popes not only have been apologetic to the Jewish community but also are active together in ecumenical meetings and services with Jewish congregations, whereas I have also been personally involved as well.
And I still think it is logical back flips. The trouble the church has gone to to try to force certain concepts together that don't belong together!
Partially true as there's a bit of illogical that's in the Nicene Creed so as to bring those within Arianism into the fold during the 4th century-- which actually did work, btw. However, the Greek influence with the writing of the NT in general is that which we should focus in on vis-a-vis this discussion since the concept of "essence" is very crucial to a basic understanding of the Trinitarian concept, minus the specifics.
Anyhow, my post back to you was meant merely as an explanation, thus not as a debate or on-going discussion. Personally, especially since I'm on the lunatic left-wing fringe of Catholicism, I really am quite ambivalent about that concept.