My opinion? Hell is death, the eternal sleep.
Even the pope calls it spiritual darkness, the being cut off from gods light and grace so why should a religion that has always used fear for a literal hell as a VERY powerful tool to gain authority and wealth give room for a non-literal interpretation in our modern day society? Because they know it's bullshit!
Also, at this forum much has already been said about religions and how their symbolic presentation of faith and good and evil seems to be directly inspired by movements and seasons of nature, earth and cosmos. Summer and winter, day and night, light and darkness, warmth and cold, birth and death etc.
We can imagine how weather conditions such as rain that made crops grow and frightning thunder and lightning must have triggered ancient people into looking up and believing in higher and powerfull invisible entities/god(s) high in the sky that need to be pleased to live long and prosper.
On the other hand, sink holes, earthquakes and vulcanic activities may have given the impression that below us a violent world of torment, fire and death exists.
This became heaven and hell... embedded in our collective thinking for thousands of years.
I can understand why it will take time to get those tendencies out of our genes and suppress our emotional instincts that allow or even thrive on superstitious fantasies in our minds.
I think we're on the good way to no longer allow man made religious authority fueled by fear , unless science will discover some giant bdsm room deep down below our feet. Sooner or later signals and sounds of tormented people would be discovered by hyper sensitive apparatus don't you think?
You wrote
Many people of all denominations are beginning to believe that Hell does not exist -
True, and there is a reason for it... and btw, not this guy