Hey there, i just wanted to clear a few things up for anyone who is confused still.
Jesus did die and resurrect from death, but not until after he visited those who died before He came.This was to give them a chance also to repent to our Savior.All those before Jesus birth who died in sin.

As for eternal Hellfire, it will actually be a blotting out of all existence,from the creation of God’s children to His return.You see God would never allow those who enter Heaven to have to sit there and watch those who didn’t make it to eternal life roast in a lake of fire for eternity.Those who do not make it will simply be just blotted out.Never existed,never born through woman,no memories at all of them.My friend’s that is called death of the mortal soul

Fear not what man can do to your flesh, but fear God that can kill flesh and your soul
God creates He can also un-create.