Some personal opinions…
I think that Protestant Evangelicals are too focussed on “getting your sins forgiven.” Some identify entering the people of God (“conversion”) with God forgiving all the sins that you may ever commit. (This is not biblical – we must repent of our sins, for God to forgive them. We can’t repent of them, before we commit them.) Paul’s letter to the Galatians is all about the benefits we have in Christ, beyond having our daily sins forgiven.
There is this centuries old trend in some groups to translate the Greek sozo/swzomai as “grace.” But it really is a broad concept of the kind providence of God to save and preserve, that goes far beyond forgiving sins daily (as Jesus mentions, in his “Lord’s Prayer”). This kind providence of God is not limited by an evangelist publicly declaring the good news.
In the Psalms, we see the assertion “Where can I run and escape your Spirit?” No matter where we are, the Spirit of God is present. We should not try to artificially limit God’s power to speak to anyone, at any place, in any culture.
Paul states that God has revealed basic right and wrong, to all human beings. We may call this the conscience, or moral consciousness. We may choose to respect this knowledge, or not.
Jesus gives us a universal promise: “Seek, and you shall find.” There are no other preconditions. This is amazing. I take it that the person who sincerely seeks, will be met with God’s kind providence.
We have Solomon’s prayer in the Old Testament, asking God that if anyone in the nations on earth prays toward Jerusalem, and the temple that Solomon has built, that God would hear their prayer. This is not a Jewish thing.
Unfortunately, some Christian groups hold to a definition of human sinfulness that goes far beyond what Paul teaches in Romans 1. Paul teaches sinfulness, AND free will. Calvin teaches sinfulness AND the lack of free will (to choose to repent). I choose to accept Paul’s view of reality. Even a fallen human being can recognize when God reveals the difference between right and wrong (this is part of the definition of “reveal”).
I would rather leave HOW we make the choice to turn from our sins, and accept forgiveness from God, to God. I don’t think that the theologians have any right to lecture God, on how his kind providence must work.
I would rather leave open the question, of what happens to someone who has never heard about the life of Jesus, but sincerely prays to God “God forgive me!” Given that the Bible says that God wishes for all to be saved/preserved, I take it that God’s kind providence will meet this person. We have the same case in the “saints” from the Old Testament, who knew nothing about the future coming of Jesus, yet benefitted from his future death to forgive their sins. All the classic references to God forgiving sins, come from the Old Testament, before Jesus was ever born.