No third party has risen up high enough to compete. You are right, but no third option has made its way to the forefront. As for religion and politics, that will be extreamly difficult untill the aforementioned 3rd party comes to being. And even then, the cults of America will make it where life is hard if you are not part of thier groups. Even if we make it illigal to do so: see civil rights movement in the 60's.