You know Mary was a Jew, and you know Jews do not believe in sons of God, yet Mary (according to scriptures) practiced her jewish faith devoutly.
Can't have it both ways.
What Jews believe today and what they believed 2000 years ago are two different things. They were watching for the Messiah then. Herod even put out a death decree for infants of the age. The prophecy of Daniel 9 is about a coming Messiah telling the exact year he would come. They knew. Many did convert. The first Christians were all Jews!