Not exactly unique to Bush, or Obama. When was the last time we had a self-identified non-believer, non-Christian, or atheist in the Oval Office? Or someone who just didn't feel like going to church? Pre-20th Century?
Even Obama's gotta show he loves Jesus. He had to network his way his way into political recognition though membership in the community's socially-influential church. Whether you want to or not, if you want to be taken seriously as a candidate in America, accepting and displaying your faith to fellow members of your community, and to the electorate, is an obligation. Or at least a required gesture.
Obama wouldn't be the first to take a nap in the pew with his eyes open on Sunday morning. McCain, Hillary, Romney, Edwards, too. All members. It's gotta be on your resume. Can't get elected in America without being a church member. People expect that.
What we don't like is a President that really is a person of faith, and actually believes in all that crazy gospel shit, that's dangerous. We just want them to show up a few times, and pretend to believe. For social and tradition reasons. How messed up is that?
It's not the candidates, it's the electorate we should be worried about. We're a nation of self-deluded hypocrites ! God bless us, every one!