Religion can be helpful in politics.  This is only if religion stays within the legislators and out of the legislation.  By this I mean that politicians should have some sort of guiding principles, whether it be a religion of just a moral code.  They should be open about how their morals will guide their decision-making processes so the voters know that they are getting themselves into by electing them.  Beyond that, its up to the voters to decide whether or not their religion belongs in politics.