Serious question. Thanks.
God is going to build a Heaven. It's more like you are going to build a large mansion, and to invite people to live with you forever. Will you accept someone who keeps teaching your children to become drug dealers and additive to drugs? You won't. So before you accept anyone to live with you, you need to set up criteria and rules for everyone to follow if they would like to live with you. That's the nature of what Law is.
Once rules are set, all candidates are equally judged under open witnessing. There's not much you can do even when you are God, if some candidates failed the judgment under open witnessing and in an open judgment.
In a nutshell, those not chosen are those not "suitable" to live with God in a forever realm. God's job is to define a covenant such that they would be disqualified openly and removed. He also defines predestination/fates for those "suitable" to live with him for them to show up as who they are, such that they can be qualified openly in accordance to the covenant in place.
To put it another way, God knows before hand who is going to be saved and who's not. However there's not much He can do if someone is openly witnessed and openly judged as the "disqualified".
That being said. God is the God of living but not the God of the dead. If you want the dead to be saved legitimately, Jesus would have to be crucified twice (this won't happen, that's why God is not the God of the dead). If on the other hand, you would like the dead to be saved illegitimately, it only means that God is not a just God to fail to stick to His own Law and covenants. If so, God's realm is not a lawful realm.
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