so the god you follow is going the put to death or worse put in to this Hell forever, 6 billion that are alive today, that live in gentile nations that follow pagan religions and have for centuries ?? that is a merciful god for sure.
What the others point out is that apart from God's intervention, some folks will face justice. We are saved by his Grace, It is also worth mentioning the fact that God is fair, just, righteous and truthful so whatever punishment they receive will be appropriate.
We don't know how many people will receive God's mercy but I don't think it will be as few as you imagined. Remember what the Apostle Paul said in his letter to the Hebrews. In chapter 11, Paul describes several heroes of the faith and they all share a striking distinction. They knew very little about how God would save them. Paul sums it up. All one needs to know is that God exists and that he rewards those who seek him. Hebrews 11:6. Folks like Enoch and Noah didn't know that Jesus would die on a cross to save them from their sins, but Enoch was taken because he had faith in God.
The same is true of Gentile pagans living in other nations. Among their number, there undoubtedly exist some who believe that God exists and that he rewards those who seek him. One does not need to know the entire content of the gospel in order for God to save them.
and then explain what occurs to the babies that die at birth or at one or two or three,
what happens to those born autistic -- can't think
I can't speak to the issue of babies, but I know that God is loving, good, and righteous. And I trust that he would do the right thing, whatever it is. As for Autistic children, I can speak from experience. I have a friend who has an autistic child and I watched him grow up to become a young adult. And I could see the spirit of God at work in this young man. He was genuinely interested in the gospel and was able to communicate his thoughts.
Then there was the case of another autistic child who, although he could barely speak, was genuinely engaged with the teaching at church. One day, I stood in the back of the church and prayed, "O' God, let help this boy speak his mind." The boy grew up to be a thoughtful young man, and he graduated from College. God is truly great. merciful and worthy of praise.
The doctrine you have been taught is very very problematic.
What happened to those in Noahs flood ??
what you are believing is God can't save but very few
You are right to be concerned. Hopefully I have given you some things to think about.