This says non-Catholics who have not committed a mortal sin can go to heaven, which includes "have no other God before me." Further, I'm pretty sure they consider the sacrament of baptism necessary to go to heaven, defacto ruling out every non-catholic.

edit I'm apparently somewhat misremembering things, and any non-catholic without a mortal sin has a supposed chance, but I still would say that rules out all non-catholics.