In my opinion Obama is a fairly secular guy. I believe he got involved with religion because he saw what it does in poor communities (supposedly gives hope, undisputedly has lots of power), and he got into community organizing to make a change and make Chicago's south side less poor.
To be honest, I agree with him very much. Many Americans do cling to religion and other things when they have little hope elsewhere. I have a strong bias being a non-believer, but its true. Faith can be healthy in some ways, but I just don't see it being a good thing overall.
Obama sees this religious stuff as a vehicle to get things done, and its not the religion part I think he personally cares deeply about. I think Obama sees religion as a tool to get things accomplished in a fairly religious nation. Both Democrats and Republicans have intensely religious constituencies, unlike Canada where religion doesn't really play a role in any party except in certain Conservative circles.
Maybe Obama can be a sleeper cell. Since so many Americans are gung-ho fundamentalist Christian, maybe he can entice them with what he's done and his religious knowledge enough to make them feel comfortable so we can actually have a fairly secular intellectual run things for a change.
Bush has been a world travesty and I can't imagine how he ever got a majority vote anywhere in his life.