I would have said the exact opposite.
The Universe is our heaven, not Hell.
Beautiful flowers, Bees, blue skies, fruits, green pastures, magnificent mountains, clean babbling mountain streams, birds, cute little mammals, etc etc.
Of course those who have fantasies of gods are never happy, and this heaven is not good enough for them, so they invent a fictional afterlife.
Let them grow up on Venus or Mars and I think they would be envious of our beautiful heavenly world.
Unfortunately we eventually die to make room for future generations, our turn is short so make the best of your temporary sentience in the only heaven you will know.
There is no Hell just the dust and cold of death.
Cheers