Heinlein's Orphans of the Sky contains some things that, to me at least, appear to be direct religious commentary / allegory / parody. For instance, the name of "Jordan" being God, and the mention that saying "Jordan" or "Huff" was swearing.
The belief of the "Trip" to mean the afterlife. They sacrifice to the Converter. The sacred books thing, and the interpreting it as being metaphorical instead of literal. There are others.
Given the sheer number of references and parodies there are, I'd be very surprised if this wasn't intentional. However, my Google-fu is failing to reveal any sources that even mention these parallels, let alone say if they were intended or not.
Are these actually biblical parallels, and, if so, were they intentional on Heinlein's part?