Why? Fundamentalists are noisy, but they aren't a majority. Catholics are the largest group, probably followed by the various types of non practitioners (I'm including atheists and people that "aren't sure" together there, I think it's fair to say that "not sure" is a ways away from fundamentalist). It's harder to sort out the protestants, but the more moderate "mainline" groups certainly have more influence than the fundamentalist groups, even if they don't quite outnumber them (but they are at least similar in number).

The type of news that fundamentalists end up making also isn't all that discouraging, they are usually losing court cases where they tried to inject their beliefs into public life.