No, I hadn’t forgotten that Jesus was a Jew and it was Paul who preached to the gentiles.
Regarding the Jews crucifying Jesus, crucifixion was a Roman method of execution, the Jews stoned people to death. From what we now know about Pontius Pilate, he was a cruel and ruthless individual and if Jesus was claiming to be the Messiah he would have had no hesitation in executing him for treason.
The reason the Jews didn’t covert to Christianity is that their faith was in Judaism, people’s religious faith tends to be strong and they tend not to change it, that makes them difficult to convert.
Has it not occurred to you Jesus fulfilled at the prophesies in the Old Testament which Judaism follows.
The Old Testament is the Torah, the books of the Prophets and the books of the Writings. Within Judaism this trio is known simply as the Bible, or the Tanakh, an acronym derived from תורה/ Torah (Teaching), נביאים / Nevi’im (Prophets), and כתובים/ Ketuvim (Writings). When the term Old Testament is used, it is often in order to distinguish it from the New Testament, a collection of Christian books and letters that are not part of the Jewish faith.
The Old Testament ended with Malachi 430 years before Jesus’s birth.
But the Old Testament contained prophesies about the coming Messiah promised to the Jews.
Prophecies Christians consider fulfilled by Jesus from the Old Testament. But because the Jews rejected Jesus as their Messiah, Christianity was created to account for the fulfillment of OT prophesies.
Daniel 9:24–27
Deuteronomy 18:15
Ezekiel 37:24, 25–27
Hosea 11:1
Isaiah 7:14
2Isaiah 8:14
Isaiah 8:22–9:1 (9:1–2)
Isaiah 9:6,7 (Masoretic 9:5,6)
Isaiah 11:12
Isaiah 28:16
Isaiah 53:5
Jeremiah 31:15
Micah 5:2 (Micah 5:1 in Hebrew)
Psalm 2
Psalm 16
Psalm 22
Psalm 34
Psalm 69
Psalm 110
Samuel 7:14
Wisdom 2:12–20
Zechariah 9:9
Zechariah 12:10
Verses read as Davidic line prophecies