I'd like to know where the heck they even got this idea from in the first place. Most Christian ideas of hell is largely a pop-culture construct based on the writings of Milton and Dante. Even the word itself is derived from Norse mythology.
The idea of burning for one's crimes comes from ancient hebrew customs. Outside Jerusalem lies the Valley of Hinnom, once home to an actual burning pit of human and household waste. As punishment for their misdeeds, criminals were often cast onto the fires after death as a way of disposing of their bodies. It is not a lie to say that Hebrew parents probably once told their kids that if they were naughty they would 'burn in the fires of Gehenna'!
Biblical 'demonics' is largely allegory for at-the-time poorly misunderstood mental health problems. Jesus own temptations probably came more from his human side than a personification of evil. I'd imagine being told at the age of 30 that you had to leave your comfort zone and go minister directly by God would be quite anxiety inducing. Did he ever suffer from imposter syndrome like the rest of us? He would have hidden it from his biographers, thats for sure.
Hell may well be just an idea, but one grounded more in reality. We know that if we place our faith in things other than Jesus we will only ever end up disappointed that the reality never lived up to our ideals. Money, politicians, technology: all come and go. Perhaps we are destined for Hell without that guiding faith, only it is our own personal demons and inability to forgive ourselves that is the true punishment.