You are ignorant. Israel celebrated the first Passover just prior to their Exodus from Egypt. In the desert, they were commanded to keep the Passover celebration every year in remembrance of God's salvation from slavery. This celebration was to continue in perpetuity.
The Talmud tells us that in the time of the Messiah all sacrifices would end... except for one; the offering of praise and thanksgiving. Ironically (and totally a coincidence I'm sure!) this was the bread and cup offering of Christ at the Last Supper... in praise and thanksgiving for our new Exodus across the waters of Baptism from slavery in sin to rebirth in the Family of God. He commanded us to continue this celebration in remembrance of Him.
The Church keeps this celebration at every Mass and delves deeper into the mystery annually in the feast days of the Easter season.
You listed a day known as "Holy Thurday" and one called "Good Friday". I stated, correctly, that there are no such days in scripture. The holy days of the Lord are listed in Leviticus chapter 23. These days are not there and are in fact later inventions of the traditional church.
I don't think it's wise to base Christian beliefs on Jewish tradition...
Well Passover is an historical event and the death of Christ was redemptive and he commanded us to remember that redemptive death on Passover.