What about those Jews who became Christian?
well, the Word tells us not to be unequally yoked with unbelivers
Therefroe, Chritians should generally live (closely) with only Christians. But of course, if you take that to its logical conclusion, you may have to get out of the world altogether... which some day, Thank God, we will, as long as we keep Faith. But that is the point
it is virtually impossible to keep Faith when you are always and forever around non-Believers.. .