You're assuming the "new testament" to be "scripture." The point I'm making is that by reversing the role of the Jewish People in the cosmos the "new testament" (in light of previous Revelation) comes across as an imposture.
How can recognizing that many, perhaps even most, Jews were obstinate in their opposition to God be taken to be "reversing the role of the Jewish People in the cosmos?" I seem to recall a few times in the Old Testament that the same idea is presented.
In the "old testament" they are labeled obstinate when they deviate from the Torah. Chr*stianity labels them obstinate for refusing to cease observing the Torah and replacing it with something else.
And again, the truth of chr*stianity and of the "new testament" is hardly "self-evident."