I believe it is true that Christianity has had a net positive influence on our government. However, I do believe in the separation of church and state. I think that many bad things happen when you try to blend the church (or religious establishment) with the government, as one can see by looking at much of European history and many current day Islamic countries. No establishment of religion (church) should ever control our government, but it is impossible to seperate religion from government since there are religious politicians who will have the moral codes from their religion guide them in their policies. I would also question those who believe Christians are given extra rights in the US today or the 20th century. Compared to other nations, we have always been kind to those who don't believe the same things we believe in (especially compared to nation's that follow Islamic ideas).
It's called Separation of Church and State for a reason. If this were to happen than it would mean that Christianity is the "chosen" religion. There is no right or wrong religion. This would isolate people. Believe it or not, there are many atheists and agnostics in this country. We all deserve the same rights, that goes for the government too.
The American government was founded on the idea that everyone should have freedom of their religion and that everyone is entitled to their rights and happiness. Christianity's influence on American politics has lead to unequal rights for particular groups, which goes against the tenants of our society and must be stopped. Just because some people in power have Christian beliefs doesn't mean that those beliefs should be inflicted on everyone, taking away fundamental human rights of others.
What people of this nation and the world need to remember is that one of the founding ideals of the United States of America was the separation of church and state from one another. Because of this, Christianity should have no bearing on American politics in any way, shape, or form.
Not everyone believes the same thing, so to say one system of beliefs should rule everyone is ignorant. You can't possibly make every belief system happy, and to try to do so will cause animosity among the rest of the people. Our best bet is to keep politics and religion separate, this way everyone has complete freedom to believe what they want with out other ideas being forced by the government. Religion restricts freedom of believes and unbelievers, it has no place in governing the population.