"As far as I'm aware, Christians from those 7 countries are not banned, is that correct?"
No that is not correct. All people holding citizenship of the seven countries concerned (and ll refugees from Syria) are effected by the (now suspended) order. Read the text of the order. Here it is (again) but this version is annotated with comments from NPR (National Public Radio) journalists:
http://www.npr.org/2017/01/31/512439121/trumps-executive-order-on-immigration-annotated
I've read the text a number of times and it says absolutely nothing about any religion. The fact is that citizens of those countries are almost exclusively Muslim but the (very) few people of other religions who hold citizenship of those countries are similarly effected.
"...which NJ has finally accepted."
I have never disputed that it is first and foremost a ban on Muslims. What I did say - and still say - is that the Executive Order does not mention religion and does not mention people with "arabic-sounding names". It has been called a "Muslim ban". It is not. The order does not relate solely to Muslims but because of its scope it is almost exclusively Muslims that are its target.