Ignorant and presumptuous. First not all of the Christians believe in jews returning to Israel as precondition of Christ return. Second not all of them talk about conversion. Many of them speak about Jews believing in Messiah but not becoming Christians since Jesus was a Jew and never was a Christian. And finally you should see the difference between Rabbinic Judaism and Jewish identity. We should talk rather about Judaisms in plural and possibility for somebody to remain a Jew and believing in Yeshua same time.
from the article: All signs say Iran is racing toward a nuclear bomb