I suggest you reread the bible in the light of Grace. God’s plan is to redeem his people to life everlasting in his holy presence. He revealed his plan through Christ Jesus. He made it very simple. Faith as small as a mustard seed is all it takes to find your way to Christ as Savior.
As Jesus made clear, God’s timeline is his is own and He has not revealed it to any man, including Jesus.
You are obviously faithful and have studied much. My studies have lead me to believe that we are called to proclaim Him and love much. Everything else is frosting.
I can’t help but feel sad for the little boy in Adam Lanza that did not receive the help he needed. And for his mother who didn’t know how to help him. If he were alive he should go to jail. But he’s not, he’s dead and it is not for me or you to decide his spiritual fate.