If men could be saved without God revealing Himself to them then there would be no purpose in the great commission would there?
Scripture tells us that no man comes to the Father BUT by Him...He does not give alternative or “excepts”
We know that the OT Jews had encounters with God and Christ that were saving. God has revealed that to us. People were saved by grace and mercy before the cross,as God so ordained to reveal Himself
Your question flows from the belief that somehow it would not be “fair” or that in some way God has an obligation to save anyone.
The truth is all men deserve hell, that He saves any is a miracle .
Romans 9:14 What shall we say then? Is there unrighteousness with God? God forbid. 15 For he saith to Moses, I will have mercy on whom I will have mercy, and I will have compassion on whom I will have compassion. 16 So then it is not of him that willeth, nor of him that runneth, but of God that sheweth mercy. 17 For the scripture saith unto Pharaoh, Even for this same purpose have I raised thee up, that I might shew my power in thee, and that my name might be declared throughout all the earth. 18 Therefore hath he mercy on whom he will have mercy, and whom he will he hardeneth.
Not at all, I'm just wondering.