What about the people from after the tower of Babel? Those who were not taught about God by their parents. As an example When Moses went to Pharaoh to set his people free, Pharaoh asked who YHVH was. He did not know of him. This suggests that there were people that had not heard of God during that time from after the tower to the time of Moses. I know there are those that knew of God during this same time such as Job and Abram. Why would these, who had not heard of God not be given a chance to accept or reject salvation?
I will try to answer your excellent question. You may not like it but it is Biblical.
Genesis 15:6 tells us that Abraham believed God and that was enough for God to credit it to him for righteousness. That is confirmed in Romans 4:3-8.
You see, the Old Testament sacrificial system did not take away sin, as
Hebrews 10:1-10 clearly teaches. It did, however, point to the day when the Son of God would shed His blood for the sinful human race. That is exactly why the spirits of the faithful saints in the Old Test. could not go to heaven until Jesus actually died and rose again! It was only then that their sins were wahed away instead of just being "covered" with animal blood.
Now then......
.God’s requirement of what must be believed is based on the amount of revelation He has given mankind up to that time. This is called progressive revelation. Adam believed the promise God gave in
Genesis 3:15 in that the Seed of the woman who would be Messiah Jesus, would conquer Satan. Adam believed Him, demonstrated by the name he gave Eve (v. 20) and the Lord indicated His acceptance immediately by covering them with coats of skin (v. 21). At that point that is all Adam knew, but he believed it.
Abraham believed God according to the promises and new revelation God gave him in
Genesis 12 & 15. Prior to Moses, no Scripture was written, but mankind was responsible for what God had revealed. Throughout the Old Testament, believers came to salvation because they believed that God would someday take care of their sin problem.
You see, our salvation is actually based on CREDIT! The Old Test. saints believed in Messiah looking "forward" and we believe on Messiah Jesus looking "Backwards" but both are rooted in FAITH.
Now did the LOST who died not knowing about God go to hell?? YES! WHY?????
The testimony of Scripture is clear that all unconverted people are under the wrath of God. Paul writes, Romans 1:18......
“For the wrath of God is
revealed from heaven against all ungodliness and unrighteousness of men who suppress the truth in unrighteousness” .
The verb “is revealed” is in the present tense. This means that at this very moment, wherever an unbeliever is on the earth – whether he has heard the gospel or not – he is already under divine wrath.
John 3:18 ........
" He that believeth on him is not condemned:
but he that believeth not is condemned already, because he hath not believed in the name of the only begotten Son of God."
Romans 1:20.........
"“For since the creation of the world His invisible attributes, His eternal power and divine nature, have been clearly seen, being understood through what has been made, so that they are without excuse”.
This of course opens the door to the Bible teaching that there in hell, there will be differing degrees of punishment based on the revelation of knowledge known.