The elites who are controlled by the fallen angels are the subject of the song. They too want to be gods (“Olympus or bust”) & are messing with DNA, the formerly secret building blocks of life, to create the perfect Beast that will be indwelt by Apollyon when he rises from the pit. They sarcastically say to Jesus,
Relieve all pain and suffering
This refers to taking ALL of mankind’s sins on the cross to lift us out of the dark and bring us to His marvelous kingdom of light.
And lift us out of the dark
Turn us all into Methuselah
Those saved are promised to be given glorified bodies by the LORD that will never age, get sick, or die & thus live forever, analogous to the man in history who lived the longest - Methuselah at 969 years.
But where are we gonna park?
Sarcastic - they erroneously believe there won’t be enough room on earth for all these people who will never die.