This two minute audio is the clearest and most concise description I've come across of the difference between Nirvana and Heaven - and the difference between the aspirations of Christianity and 'Eastern' religion (as it is known in The West).
What John Butler expresses is the desire for oneness with minimally-conscious, immersive, abstract bliss; an impersonal absorption into the unity of divine love. He describes deep meditation - which he practices for about five hours a day - as been similar to death (as he understand death).
And he yearns for death to come; to be rid of his body and the thinking mind - and thus to become a discarnate and ego-less spirit.
John Butler calls this state the Kingdom of God and Heaven - but of course it is not: it is instead the stripping away of all that makes us human. JB uses Christian language, but this is not a Christian desire.
There would be no reason for Jesus Christ to incarnate as a Man - to experience mortal life and to die and be resurrected; if our ultimate destiny was to become impersonal spirits fused with the abstract divine. In fact; if such was our intended destiny, there is no reason for mortal incarnate life at all - this embodied, thinking, personal life serves no positive function.
Jesus Christ offered us a totally different kind of Heaven: a resurrected life eternal of immortal Men with indestructible, solid bodies. We die, but remain our-selves. We continue to think! Christ was resurrected, not reabsorbed; he continued to think and be a separate person; he did not lose his ego-identity and consciousness.
The Christian Heaven is one of persons, each different and distinct. And the loving relationships of Heaven are not any kind of fusion, but are inter-personal; they depend on us remaining individuals. As I understand Heaven, it is a place of creating; and we will participate with God, and Jesus Christ and the Holy Ghost in the eternal work of continued creation.
By contrast, in Nirvana there is no creation - only being: it is change-less; outside time and space. The God of Nirvana is not really a God of creation; because our created world is seen as an evanescent illusion (maya); and for us to believe creation is real or eternal is a delusion. The God of Nirvana Just-Is, unchanging, forever.
There seems little doubt that John Butler genuinely wants a blissful and impersonal Nirvana; and does not want resurrection to the Christian Heaven. He wants to cease to be as an embodied thinking person; he wants to remain alive forever, but conscious only of the bliss of being absorbed-into divine love - with 'love' being understood as an impersonal disposition (perhaps something analogous to glowing light, a gas, field of force or magnetism, or a vibrational state).
How would God, our Heavenly Parents, be likely to regard John Butler's wishes? Would God be likely to grant them?
I think God would be sad that JB has rejected the great gift made possible by Jesus Christ; and sad that JB regards incarnation, thinking and the capacity for inter-personal love as worthless. Sad that JB regards this world, and the mortal lives of Men as worthless. From JB's perspective, implicitly - this life and our experiences are temporary errors that he wants to be undone forever.
God might be irritated, or even angry, at John Butler's preaching of Nirvana as if it was Heaven, and by his denigration of God's work of creation, and Jesus's work of salvation. But this may well be regarded as a product of humanly understandable confusion - since there are major inconsistencies in JB's ideas. For instance he praises and responds very powerfully to nature, animals, the stars, even human beings sometimes! Yet, ultimately he regards them all as worthless, indeed meaningless; implicitly he regards his powerful subjective responses as mistaken.
God would therefore be understanding of the misery that mortal life seems to hold for JB; and sympathetic about his desire to 'hand back the entrance ticket', and give-up on being a Man. Listen again to that recording above: there is a man who - at the bottom line - really wants to be dead, with his death conceptualised much like a permanent, deep sleep of unawareness.
More importantly, resurrected Heavenly life is voluntary, a opt-in situation. God would not, therefore, punish those who chose otherwise, as such; else the choice would be coerced and the followers of Jesus merely conscripts!
Heaven is for those who love Jesus, and fellow Men and such love is free and cannot be enforced. Those who are incapable of such love, or who have other priorities, will have other fates. From various clues and insights; the 'system' seems to be that the eternal consequences of each person's own free choices are themselves their own justice - we judge our-selves: external 'punishment' is neither required not appropriate.
In sum, Men make their own Hells by their own choices; and, presumably, their own Nirvanas too. A Man who wishes to cease being a Man, and wishes to become fused with what he sees as the impersonal reality of the divine (since he is unable or unwilling to regard God as a person); will presumably be given pretty-much what he asks for - that is, an eternal state in which his consciousness experiences what he most desires.
So, I would expect that, when John Butler dies, he will reject the possibility of following Jesus to resurrection; and instead be enabled to experience what he so much wants: that is, a state of mere-being, aware of impersonal bliss with no perceptible change, and an absence of experienced time and space. As consciousness dwindles towards this minimum, John Butler will (I guess) probably be very pleased and grateful at the prospect!