“ The biblical origins of the Mass and the New Testament priesthood are rooted in the Old Testament. ”
!
Exactly.
Stolen from Jews, while rejecting New Testament revelation for the Church.
“Thou shall not steal”
And of course, with paganism mixed in.
So now you say that we Christians have Christianity stolen from the Jews???
Perhaps you need to read the Bible especially the book of Revelation which talks of the Church as the New Jerusalem.
Come to the Church of the Pentecost - the One Holy Catholic and Apostolic Church — and leave your non-Christian beliefs behind including that perversion of scripture that is outside orthodoxy