Heaven? Jesus is the only person that can easily defeat Kenpachi.

Are you talking about Hueco Mundo or Las Noches? Neither mean heaven, just 'hollow world' and 'The nights'. I do think that some captains will go to Las Noches, and you should know why. I'm not telling because I hate that stupid spoiler tag.

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Atheism
The belief that there was nothing and nothing
happened to nothing and then nothing magically
exploded for no reason creating everything and then
a bunch of everything rearranged itself for no reason
whatsover into self-replicating bits which turned into dinosaurs.
Makes perfect sense!