Upvote:2
In fairness, it is probably best understood in the opposite direction. Technically, "the Way" - those Jewish followers of Jesus the Christ, were Jewish heretics.
The story is better explained here: At what point did Judaism and Christianity diverge?
For the continuing saga, you may find this useful: Was Catholicism the first denomination?
It should be understood that despite the historical link, non-Jewish Gentiles came to predominate fairly early, explaining the 'millions upon millions with no DNA links.' Most of the New Testament, for example, was written to Gentiles in what is today the country of Turkey.
The Anti-Semitic sentiment that he evinces, however, unfortunately has a fairly lengthy pedigree, as this answer shows.
Upvote:3
Strange as it may seem, there are people who hold this view currently, and in fact it was actually the doctrine of the Catholic church in the past (I hasten to add, they would not express their doctrine in those terms currently).
Proponents of such a view assume (without sufficient evidence imho) two things:
Christians are the covenant people of God - the true inheritors of the Old Testament religion that was necessarily 'perfected' with the advent of Christ. This doctrine is known as Supersessionism or Replacement Theology and was more widely held in the past than Dual-covenant theologies or Dispensationalism. This essay on the differences between Israel and the Church introduces some of the relevant issues.
Modern Judaism, is not merely a failure to follow the 'perfected' version of the religion of the Old Testament, but a departure from the original. This latter case is built on an association with the Pharisaism that Jesus opposed and modern Judaism, and argues that even further divergence has ensued since. Such arguments point to the destruction of the temple as marking a significant discontinuity in terms of orthopraxis, and highlight things like 'the council of Jamnia' and the collation of the Talmud as being significant further divergences from the will of God.