This is a good discussion.
McCain CAN (and has on a FEW occassions) talked about his faith. I think the question may have been better asked as "WHY"
I think Al is exactly correct. Look at the difficulty Huckabee had with the question of his faith. Hell, we almost didn't elect JFK because he was a Catholic...I remember the fringe element saying he'd build a tunnel between DC & Rome.
I think too many people put too much emphasis on religion (this comes from 13 years of Catholic education, 3 by Jesuits!).
You'll agree too many people 'wear their religion' like a designer suit; once home the suit is put into the closet.
To me I want to be around & to know people who DO good. I could care less if they can quote the Bible (actually I wish they wouldn't) or even go to church. To me a person that does good has an inner 'something' and I think that they are (in their way) close to God.
Al called our Founding Fathers 'flawed' & he is right and not everything they opined is relevant to today's society.
The Bible is similar. It has gone through countless revisions and so much of the early days was word of mouth...I choose to use it more as a guide or road map.
I have a high opinion of God....hey, He mad me! He gave me a good mind (that I don't always use to potential), parents (who programed my moral compass) and free will. Then (I think) he stepped back and said, "show Me what you've got." I don't believe God is a micro-manager with his input in every aspect of our lives (there's that bug-a-boo 'free will' again).
If I may use a very simplistic (I'm good at being a simpleton sometimes)....when I coached youth league baseball we told the kids what we wanted to do, showed them how to do it, made sure they could do it and then came game time....we asked them...expected them....to do it correctly.
That is my concept on how God is. He NEVER abandons or fogrets us; but he lets us make our own way, to stumble or to run....our choice...if to use His "guides" or not....our choice. When we talk to Him, He listens. I know we don't always like His answers...as I didn't when my own dad would tell me to "think it through"
Anyway, there are other people who don't think as I do (can you actually believe that?) they get comfort fro the Bible and warmth and security and fullfillment from believeing He IS a micro manager......many of them take it to the extreeme (to me, anyway) and voila...PRESTO....you now have a single issue voter.
Because of that I think many politicians play their "walk" closer to their chest.
After all I think we all know some...several....many(???) Christians (self professed) who are terribly judgemental. I think many politicians just try to minimize the fallout by keeping their 'walk' as personal as possible.