Rick was a robot and believed in Robot Hell and that was pretty much it. Any other beliefs were human conventions he adopted superficially and only circumstantially so.

"Up there. Space." Rick jabbed his index finger at the ceiling, finally feeling like all the burn of the smoke was settling into a tolerable feeling. "...I guess space Heaven or whatever some people believe--up beyond the clouds and all that. You been there? Didn't think a human could survive up that high, frankly."