I believe people are saved through Christ Jesus... whether they know they are or not. Moses, for example, was saved through Christ, despite not knowing a thing about Christ's sacrificial death, how atonement works, about the Trinity, about the creeds.... Regardless, he had a relationship with God, and responded to the grace and revelation given him.

And if someone in the present day likewise responds to whatever grace and revelation given them by God, I expect they likewise will be saved through Christ. The Kingdom might surprise them -- as it likely will surprise most Christians whose best guesses about what it will be like will fall far short of the reality -- but a part of them will react, "Well, of course; my entire existence has been leading up to this, and it fits perfectly." If they're where God wants them, he'll have them ready enough for it.