You say "religion mentions it", but really what religious writings explicitly mention an existence of hell? Historically, hell was never mentioned in Christian teachings until the Middle Ages, when there was a need for money in the church and war in the Holy Land. I'm not sure about Islam, perhaps someone could enlighten me?
If I am not mistaken, Hell is mentioned in two books. Mathews Gospel and Revelation. Here are the quotes.
"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" (Mark 9:45)
In a story Jesus tells, the man who is carried away into hell cries: ". . .I am tormented in this FLAME." Luke 16:24
Jesus says: "And shall cast them into a FURNACE OF FIRE: there shall be wailing and gnashing of teeth." Matthew 13:42
Jesus says: "Depart from me, ye cursed, into everlasting EVERLASTING FIRE, prepared for the devil and his angels: . . ." [Note: hell was never originally prepared for people. However, because we have broken God's laws, God's justice now demands it.] Matthew 25:41
Revelation 20:15 says, " And whosoever was not found written in the book of life was cast into the LAKE OF FIRE.
Jesus says in Matthew 5:22 "But I say unto you, That whosoever is angry with his brother without a cause shall be in danger of the judgment: and whosoever shall say to his brother, Raca, shall be in danger of the council: but whosoever shall say, Thou fool, shall be in danger of HELL FIRE.
Jesus says in Matthew 18:8 Wherefore if thy hand or thy foot offend thee, cut them off, and cast [them] from thee: it is better for thee to enter into life halt or maimed, rather than having two hands or two feet to be cast into EVERLASTING FIRE.
Jude 1:7 Even as Sodom and Gomorrha, and the cities about them in like manner, giving themselves over to fornication, and going after strange flesh, are set forth for an example, suffering the vengeance of ETERNAL FIRE.
Revelation 14:10 says: "and he shall be tormented with FIRE and BRIMSTONE in the presence of the holy angels, and in the presence of the Lamb:"
Revelation 21:8 But the fearful, and unbelieving, and the abominable, and murderers, and whoremongers, and sorcerers, and idolaters, and all liars, shall have their part in the LAKE which burneth with FIRE and BRMISTONE: which is the second death.