But I will say this, as a fan of the Baltimore Ravens, I do not put my time, my money and my emotional investment into the team to find any sort of spiritual reward (there are other channels in my life for that). I do it to be entertained and to enjoy their successes (of course, I also agonize when they fail). In return, I only ask from them one thing: a professional effort on and off the field. With very little exception, I think I have gotten that from the Ravens. And the wins are a nice by-product.
The fact that Harbaugh is very out-front with his religion doesn't necessarily cause me to be more invested in the team. I don't think Billick ever referenced god as part of his coaching, and I was very happy with the job he did, for the most part.
So until someone shows me an example of how Harbaugh's religious faith determines how the team is managed, I see this as more or less a non-issue.