This is just my personal opinion but…I honestly don’t know whether non Christians will be saved, because ultimately only God knows what is in their hearts, and mine. But you know I’m not going to take my own salvation for granted either, because I can see that even as a Catholic I reject Christ daily in my sins.
While it’s true that Jews, non Christians, etc. may be technically rejecting Christ by believing in the faith they were born and raised in, I have seen more faith in many non Christians, than I have in myself.
For example, the Jews of the Holocaust, who went to their deaths singing praises to God, and Gandhi who was a symbol of peace for His people…they may not be aware of it, but I believe Christ has the power to work through them as well, and so I am not going to make it my place to judge them.
What I really do hope is that others can see Christ working through me as well, and that I can be a sign of faith in the Church…that said, I still have a long ways to go.