Got hooked on this series over a year ago. They have shown the hell dimension of the demons and demon-like characters several times. Have they ever shown Heaven?
They don’t have a character who calls Heaven home in Pibgorn, so I’m thinking not.
'Course, now that Monty’s making appearances in 9 Chickweed Lane, and given the artist’s comfort with having characters cross over between strips, this could be subject to change. 
Another factor is that the peril Pibgorn and Drusilla have teamed up to fight is not exactly angelic in origin.
More information than you really wanted can be found here.
Why do I always get this strip confused with Pearls Before Swine, every time I hear its name? Is it that “Pibgorn” is very close to “Pigborn”, and there’s a pig in PBS?