I'm inclined to believe in a multiverse. It's a valid scientific hypothesis that has powerful explanatory properties. I would suspect that the number of universes or sub-universes is virtually infinite. The vast majority of them do not inflate though mind you.
I do not believe in a heaven or a hell or that we have a "soul", but if I did I'd prefer that there only be one heaven or hell. That would make sense for a monotheistic religion. If there's an aferlife, though, I'd prefer it to be reincarnation or maybe just some sort of post-existence where I can travel through space and time at my leisure and learn all about the multiverse. Of course, after a couple of hundred trillion years, I think that even I would be bored.
SLD
™ Version 4.2