Scripture says that only a few people pass through the narrow gate. It is also very graphic about the awful fate in store for the majority who don't.
It seems pretty clear how those billions of Asians will be dealt with.
Romans 9:13 Just as it is written, “Jacob I loved, but Esau I hated.”
14 What shall we say then? There is no injustice with God, is there? May it never be! 15 For He says to Moses, “I will have mercy on whom I have mercy, and I will have compassion on whom I have compassion.” 16 So then it does not depend on the man who wills or the man who runs, but on God who has mercy. 17 For the Scripture says to Pharaoh, “For this very purpose I raised you up, to demonstrate My power in you, and that My name might be proclaimed [k]throughout the whole earth.” 18 So then He has mercy on whom He desires, and He hardens whom He desires.
19 You will say to me then, “Why does He still find fault? For who resists His will?” 20 On the contrary, who are you, O man, who answers back to God? The thing molded will not say to the molder, “Why did you make me like this,” will it? 21 Or does not the potter have a right over the clay, to make from the same lump one vessel [l]for honorable use and another [m]for common use? 22 [n]What if God, although willing to demonstrate His wrath and to make His power known, endured with much patience vessels of wrath prepared for destruction? 23 And He did so to make known the riches of His glory upon vessels of mercy, which He prepared beforehand for glory, 24 even us, whom He also called, not from among Jews only, but also from among Gentiles.
I agree sir. It doesn't matter where they come from. If they don't come to Jesus Christ, they are lost, whether they have heard the gospel or not. I believe there was a time in the distant past, when everyone knew, and the vast majority rejected the Lord. If ignorance is bliss, why send missionaries?