What does Christianity say about hell?
Hell is a prison of everlasting chains from which there is no hope of release (Jude 6). It is a furnace of conscious torment where the fire never goes out (Matt. 13.49-50). It is a place of excruciating misery where the worm does not die (Mark 9.47-48).
Jesus - God The Son - died on a cross to rescue all mankind from having to go to hell. He proved to us who He was by rising from the dead.
Our alternative destination is Heaven provided that we: repent; mean it and give our lives over to Jesus on a permanent basis.
We cannot rid ourselves from sin and all the ways in which we have defied God. Happily Jesus can. Through His shed blood we are 'washed clean'.