Because he uses scripture and Catholic teaching to refute what Catholics try to tell us. Catholics tell us that the RCC doesn’t teach that they believe the church has replaced Israel but then the RCC tells us different
877 Likewise, it belongs to the sacramental nature of ecclesial ministry that it have a collegial character. In fact, from the beginning of his ministry, the Lord Jesus instituted the Twelve as "the seeds of the new Israel and the beginning of the sacred hierarchy." Chosen together, they were also sent out together, and their fraternal unity would be at the service of the fraternal communion of all the faithful: they would reflect and witness to the communion of the divine persons. For this reason every bishop exercises his ministry from within the episcopal college, in communion with the bishop of Rome, the successor of St. Peter and head of the college. So also priests exercise their ministry from within the presbyterium of the diocese, under the direction of their bishop. [http://www.scborromeo.org/ccc/para/877.htm]
Just as the Old Testament is full of foreshadows of the New Testament (typology), Catholics believe the Bible is clear that the New Jerusalem of the Book of Revelation is not the historic city of Jerusalem. We do not believe that present day Israel is the same spiritual entity as the historic Israel before the time of Christ. After the crucifixion, the curtain of the Jewish sanctuary was torn in two (Mk 15:37-39, Lk 23:44-46, Mt 27:51) which was God tearing his cloths. At that point, a transfer of authority happened and we believe that the fledgling Church became the New Israel. [http://www.davidmacd.com/catholic/why_did_the_catholic_church_move_to_rome_from_jerusalem.htm]
So what!
“Because he uses scripture and Catholic teaching ...”
Nope. Sorry.
The odd views of a poster who claims that Catholics are idolaters, that those who celebrate Easter and Christmas are pagans and that claims that the idea of church on Sunday is a man made tradition and apparently not either Christian or Biblical. Given that this is the point of view from which you view the world, why should anyone pay attention to your odd, often incomplete and often misread cut-n-pastes?