Well, it does kind of reflect Jesus' message, or at least part of it. Obviously it was this that inspired two of the greatest philosophers of our age, Ted 'Theodore' Logan and Bill S. Preston, Esq.
... one man had been nailed to a tree for saying how great it would be to be nice to people for a change ...
Of course, we know the DNA just liked to play around with religious ideas, like having the 'minor deities from the Halls of Asgard' booking a table at Milliways, where the Great Prophet Zarquon also makes his final triumphant Second Coming, only to disappear along with the rest of the Universe. (Presumably this was a side-effect of arriving by supernatural means, rather than the more 'scientific' front door of time travel.)
At this point I would like to embark upon a detailed discussion of the merits of the Zarquonist religion, however, due to his rather poor punctuality little is really known about the Great Prophet or his teachings. In fact, all we know is that his followers expect him to return at some point in the Galactic grand scheme of things, but in the meantime his name makes for good swearing.
Zarquon's singing fish, is that Douglas Adams poking fun at Christianity, perchance?