In your opinion. Obviously. But to many, religious beliefs are intertwined in their lives and can't be separated. IMO, it's no different that wanting someone with good diplomacy skills, or a business background or a military background. It's who they are. They want someone who thinks along the same lines. I know that's scary to some people. But that's how I feel about taxes and big government. I *don't* want someone in office who's for increasing either. If we reduced the size and scope of government, we'd all have a lot more money in our paychecks. The country would prosper.
I too don't care who (or if they even) a candidate prays to. But I won't toss one to the curb because they are more overtly religious than another. I don't care if they campaign at a church or a banquet hall. For the most part, if their beliefs (religious based or not) contradict mine, they don't get my vote.