Well, I would let the Christians from those nations immigrate with zero barriers. Especially from those nations where changes in government toward increased extremism are increasing persecution of Christian groups who have lived peacefully for centuries. Muslims, OTOH.....no.
Christians have never lived peacefully in the Middle East. They have always been persecuted. There have been periods of peace in between, but violence always erupts and they are always among the first targets (along with Jews).