First, I'd like to play ombudsman and correct something in your question. The idea of political freedom is not inherited from Christianity. It is inherited from the enlightenment thinkers such as Rousseau, who devised the social contract. A government can only govern by consent of the governed. So we give up some liberties in exchange for protections and services rendered by the government. It's a balance that we have to re-establish generation after generation. As far as how the Christian religion is imposed, I agree with the idea of teaching creationism in school. That is a very good example of how the Christian religion is imposed. One can argue that it's not Christianity, but all one has to do is ask about the nature of the creator of the universe, and he sees quickly exactly who creationism advocates have in mind. For the rest, the imposition is through legislation that is based on Christian ethics: the ban on gay marriage, the resistance and limitations of stem cell research, the continuing fights over abortion. These are more indirect ways that Christianity tries to foist itself on the population at large. You have to remember that we are not a Christian nation. We are a nation with Christians in it, as well as Jews, and Muslims, and atheists and agnostics, and Buddhists and Pagans. We don't all agree with the Christian ethic. To put legal strictures on us based on Christian beliefs is to deny non-Christians the freedoms that Christians take for granted.