No, Christianity is equally valid for the Jews and non-Jews. Christianity started from within Judaism and is not alien to it.
I agree, kind of. I was talking about Jews as a group of people. I understand that many are Christians (Messianic Jews) and I agree that Christianity is valid for Jews and Gentiles. However, I do not expect to possess any land between the Nile and the Euphrates, that is a promise to the physical descendants of Abraham. There is a different dispensation of grace for Jews and Gentiles. The important thing is that at the end, when the Church is raptured and the remnant of Israel recognizes Jesus as Messiah, we all will be saved!