"Hell as we know it is a medieval concept, not what early Christians and Jews believed"
Are you sure? Did you read
Luke 16:19-31 ?
And what about these biblical passages? :
Revelation 14:9-11
“If anyone worships the beast and its image and receives a mark on his forehead or on his hand,
10 he also will drink the wine of God’s wrath, poured full strength into the cup of his anger, and he will be tormented with fire and sulfur in the presence of the holy angels and in the presence of the Lamb.
11 And the smoke of their torment goes up forever and ever, and they have no rest, day or night, these worshipers of the beast and its image, and whoever receives the mark of its name.”
Revelation 20:10
And the devil who had deceived them was thrown into the lake of fire and sulfur where the beast and the false prophet were, and they will be tormented day and night forever and ever.
Mark 9:45-46
And if thy foot offend thee, cut it off: it is better for thee to enter halt into life, than having two feet to be cast into hell, into the fire that never shall be quenched: 46 Where their worm(soul) dieth not, and the fire is not quenched.
Matthew 8:12
But the children of the kingdom shall be cast out into outer darkness: there shall be weeping and gnashing of teeth.
Did you ever read the bible?