Far be it that God should not do right.
GENESIS 18:25. "Far be it from you to do such a thing...to kill the righteous with the wicked, (already judged), alike. Far be it from you! Would not the God of 'ALL' the earth do right?"
First of all, God is righteous, no one should deny...Those in belief through the faith of Abraham in the OT, are saved into Abraham's bosom, (Sheol), Matthew 8:11; "I tell you, many WILL come from East and West, and WILL sit at table with Abraham, Isaac, and Jacob in the Kingdom of Heaven." This was simply a place of rest, where the believing Patriarchs went to rest with Abraham, the Father of the True Faith. Any who were considered 'Wicked', (without the same Faith), were considered the children of the Devil. God foreknew them. The fact that God also foreknew their judgement was 'Set', doesn't mean His mercy was any less real. God has shown 'ALL' men the way through Christ, by His 'Finished' works on the Cross, that is available to all. But those who believe, are to keep check on themselves, by working out their Salvation, with fear (reverential),and trembling. let alone try to determine who is not saved. The beauty of having the Holy Spirit dwell within us, is a responsibility, and blessing beyond true comprehension, because we are the Light and salt in which to witness to all, and if each of us helps Christ to save one soul, then we have all done a good work of God, and our life has not been in vain.