Concerning the existence of Jesus Christ as a divine being, who is nowadays referred to by some, as God, or the Son of God.
This is a problem for me. Please don't write lengthy paragraphs explaining it. It won't help. I just want to explain my own position on the topic.
I can accept that there was a man named Jesus Christ. I can accept some of the fables and stories, even though they may be made up - they MIGHT be true. Not the part about resurrection, or immaculate conception, miracles and other supernatural events - but all the worldly stuff might be true. There was a Jewish man (a rabbi, actually) named Jesus. Judaism was already an ancient religion, having existed for thousands of years at the time. Jesus started preaching about a new religion, about his father, about how to be in life to others, how to worship, etc, and a lot of people followed him. On the other hand, this may have all been made up centuries after he was supposed to have lived. But I'm not tackling that question here. Just supposed he actually lived.
As a Jew, I went to Hebrew School as a child, enough to receive a Bar Mitzvah on my 13th birthday. I went to Hebrew School for 5 years, and was required to attend Sabbath services every week.
In the Jewish religion, one thing is stressed beyond all other things - that there is ONE and ONLY ONE God. Recall that Judaism is one of the oldest religions in the world. The other ancient religions worshipped many divinities - a god for the Sun, a different god of the Dead, a different one for thunder, etc. But the Jews didn't subscribe to this - they did, and still do, worship a single Creator.
The most important prayer in all of Judaism is called "the Shema". It goes like this:
Sh'ma Yisrael Adonai Eloheinu Adonai Eḥad
and the translation:
Hear, O Israel: the LORD is our God, the LORD is One.
This prayer is bellowed out at least once if not more, at every Jewish religious service.
The LORD is ONE. Very serious about that. ONE.
And that's one of the problems I have with accepting Jesus Christ as my savior (another other one is I'm an atheist/agnostic and have no belief in divinity at all). But if I did, I would worship the one and only GOD - not his son, mother, holy spirit, or third cousin twice removed.
The LORD is ONE. Very important concept to we Jewish folk. Even we non-believers.
Christianity teaches that Jesus is the Son of God, not actually God himself, who created the universe and everything in it. Then there is the Holy Trinity, which includes the Spirit or Holy Ghost. Now I'm counting three. Three is two more than one (in case your arithmetic is rusty).
And that is why it is not possible for observant Jews - the Chosen People - to accept Jesus Christ as God.
Now the "messiah" that we've been waiting for forever - that has me thoroughly confused. Don't ask me what the Messiah is supposed to represent. I think they keep this stuff confusing, to keep everybody guessing about what it all means.