I just tackled "The Complete Idiot's Guide To Understanding Judaism" because I'd been planning on using that background in my story ... not as a major thematic element, but as a component of the world. Having finished the book, I am confirmed in my desire, though I see I'm going to have to do some thinking about the Tau Ceti lunar cycle and how to work into a Jewish calendar without making it too convenient.
I realize I haven't talked much about my characters or the plot - this is largely because most of this was defined in the original "Scylla and Charybdis" short story. I am realizing now that my main male character (who catalyzes the POV character's discovery, plays tour guide, becomes a friend and eventually a romantic interest) is almost certainly going to be fairly devout ... which may involve some further research on my part.
The nice thing about moving a few hundred years in the future is I can deal with theory-versus-reality faith issues as having changed in the intervening centuries ... still nervous, though. May want to get someone with first-hand knowledge to read just those bits that directly relate.
I have one more book that hasn't come in yet - whoever has the Buddhism book is not giving it up - and unless it shows up before I finish my other worldbuilding book, this means I'll finally start working. Whoo.