There are many reasons why Jews reject Jesus as the messiah. For one, the Jewish messiah is no God. The title "son of God" is a royal title and the title given to angels, as well as to Adam (for obvious but literal reasons). Secondly, Jewish scriptures used by the Christians, especially those crucial to Christianity, contain numerous changes that support Christian doctrinal claims, but are not found in the Tanakh (Hebrew sciprutres).
The Christian Old Testament, even the one use by the Protestants, is a mixture of Hebrew and Septuagint (Greek OT translation) verses, even though Protestants claim their OT is the same as the Tanakh.
Subtle changes (mistranslations?) such as in Isaiah 53:5,8 change the whole meaning of verses. Thus, in verse 5, Christian translators say "he was wounded for our transgressions" and Tanakh says "from our transgressions."
Verse 8 says "for the transgression of my people was he stricken" in the Christian versions, whereas the Tanakh reads "for the sins of my people were they stricken." The Jewish sages say "mi" (they) not "lih" (he) [the Hebrew letter m and l don't look alike)
More importantly, Christianity literally turned some OT stories upside down. For example the Passover Lamb. Lambs were considered sacred animals in ancient Egypt. Killing the Passover lamb and smearing its blood on the Israelite homes was a way if telling the Egyptians that their god was nothign but a stinky animal, and wa sno god of any consequence. The lamb was clearly not killed to "atone" for any iniquities, as the Christians teach.
Likewise, the shedding of the blood for atonement applied only for unintentional sins. In Judaism the sins of willful commission could not be atoned by animal sacrifice, but only through repentance. Obviously the Christians "corrected" that too!
Besides, the sacrificial animal had to be killed on the altar, and its blood sprinkled. Crucifixion was no altar sacrifice and Jesus bleeding all over the place from Roman torture and being nailed to the cross was hardly ritual "sprinkling."
So, obviously the "correct" interpretation of the OT depends on a lot of things, liturgical, theological, translational, doctrinal, etc. Usually the Jewish rejection of Christanity is assumed to be their "blindness" whereas reading a little deeper reveals that the blindness can be relative, and sometimes even intentional.
Nope....sounds like your religious history/faith has far to go to reach the truth Kosta...and likely will never do so. Remember I did say sometimes it takes time to discern where someones beliefs are at. Yours is pointing in a particular direction.