I dont have a book rec. right now (I'll take a look tomorrow) but I just wanted to say this: To be honest I think the main problems you are having are in the communication department, and thus I think you really have to widen your "criteria" for books you'd read from Christian authors to "all" authors.
There are plenty of good reputable books and authors out there that are secular that can give you great advice on communication issues. The Godly part you can put in yourself, thats not rocket science
Just because they aren't Christian authors doesn't mean they don't have great advice.. and just because they MAY be Christian authors doesn't even mean they will talk about God, spirituality, religion, etc. in their books at all depending on the subject.
You can't judge a book by its cover

Couldn't resist.. heh
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