Well, it says that he is or was religious or at least had some reason to read his bible. ^_^ It's an inconsequential, but interesting little tidbit to give personality to what would otherwise be a nameless character. Gives him a bit of mystery I might even say.

A detail like that the reader could do a lot with. Like, say it was saying something about the main character's religion, then there could be all this guilt over his current relationship. Tiny details like that are fun because they add so much depth, all in the mind of the reader.