Consider your target audience. If its to be sold primarily in religious stores (which there are more than you'd think) then do it, otherwise I would not. Right or wrong in our shifting secular society many potential readers might be turned off. For example, half my released stories have elements that ponder divine questions, but not explicitly. I've never mentioned that in any of my promo material or blurbs, yet I've had reviewers site it made them ponder the eternal questions, and still gave me 4 or 5 stars. IOW, unless your shooting specifically for the inspirational market, don't mention explicitly.