Jews DO NOT believe in sons of God or the trinity, why then would Jesus be born a Jew, practice his faith as a Jew, if he claimed to be the son of God, if Jews do not believe in sons of God?
What Jews believe today and what they believed 2000 years ago are two different things. They were looking for the Messiah at that time.
"Who hath established all the ends of the earth? What is his name, and what is his son's name, if you can tell?" (Proverbs 30:4)
"For unto us a child is born, unto us a son is given: and the government shall be upon his shoulder: and his name shall be called Wonderful, Counsellor, The mighty God, The everlasting Father, The Prince of Peace." (Isaiah 9:6)
God's people have always known from the beginning "man was created in our image"; that there was more to God than a single person. He appeared to Moses as a messenger *angel of the Lord* in the burning bush.
Even if the Jews didnt fully understand the Godhead as many Christians also dont, Jesus revealed more about this, and we may not fully understand in this lifetime.