Well, Christianity does talk of an afterlife realm of purity or perfection, but I don't think that makes the idea exclusively Christian, anyone could hold it on its own, these are simply my musings on what such a place would actually be like according to my own ideas of purity and perfection. I have long held the belief that humanity is incompatible with perfection; when someone talks about a piece of music and calls it "perfect," for example, I always say that not only are human beings incapable of creating something perfect, they would also be incapable of comprehending or liking something that is perfect, whatever it may be, because "perfect" is entirely alien to us. Purity is similarly alien, and I think it is incongruous with our mundane lives, that if we are to ascend to a state of purity we must also shed everything that made us human and revert to a pre-birth state in which we are untouched by experience, emotion, sensation, knowledge and so on. The pure self is the undeveloped self, if you like, because it has no experiential data, it is an empty vessel capable of containing such data, but without the right input it remains empty. That is why I imagine such a place as Heaven to be indistinguishable from nothingness, because by being pure it has no allowance for anything we know here on this plane of existence, all of which is crucial to our understanding of the self and its relationship to its environment, but we would not experience this as loss because we would cease to experience anything, our memories of a time when the self and its surroundings were other than they are would be entirely lost, but we would also have no means of experiencing them as they are because there is none of that right input available.
Alternatively we could just say I was tired and drunk and leave it at that.