The glory is God’s no matter what. God offers salvation to all. Those who reject Him will bow the knee anyway and be judged. The warnings in scripture are for all. If not God could have save a lot of time on the BB by revealing Himself to us as he did to Paul.
But Jesus came and was lifted up to draw all men to Himself. All men are drawn. Some always resist.
God offered salvation to all by keeping the OT Law. No one was able to keep it according to Paul. He also offered salvation by revealing Himself in creation. Again, Paul explains in Romans all rejected that revelation and are condemned without excuse.
We do not begin on a neutral playing field, waiting to accept or reject. Everyone already has rejected and stands condemned.
John writes in repeating themes. You must understand what came prior to John 3:16 to understand the context.
In John 1, the theme of being “born by the will of God” is introduced. The children of God are not born by the will of the flesh, nor the will of man, by (the will of) God.
In John 3, John again speaks of being “born” by the will of God, this time focusing on the role of God Holy Spirit… “The wind (Spirit: the Greek word is the same for both) blows where it wills….. so is everyone born of the Spirit.
The drawing of all men cannot mean every person without exception. You have already stated the gospel is necessary for salvation. It is very likely that billions of people have lived and died never hearing the gospel.
How can they be offered salvation if they never hear the gospel?
The “draw all men” means to draw without distinction, I.e. Jews and Gentiles, rich and poor, slave and free.
John then repeats the theme of being “drawn” when Jesus declares a person must be drawn to come to the Father.
He further explains when He states His sheep hear His voice, He calls them by name and they follow Him. I’ve explained the passage at least twice in this thread, maybe three times.
He also says to some they do not believe because they are not His sheep. He doesn’t say they are not His sheep because they don’t believe, but rather the REASON they don’t believe is because they are not Hus sheep.
Peace to you