It's not faith, it's logic. Do I believe that Miers and Bush are lying about her intentions to rule as an originalist, or the hysterical contentions of pundits that don't know the woman because they are not being given a guarantee, and who only claim that WE DON"T KNOW if she'll rule is an originalist?
In addition, I think that two people whose faith is important to them are less likely to be lying about their intentions.
There is nothing the least bit logical about assuming that Christians can't be wrong.