Islam, practiced in its purity, demands death to non-Muslims and war on people who don't submit to Islamic rule. Thanks to Charleston Gazette editor, James Haught, I can refer readers to a web page that documents Islam's war on rivals of all kinds including countries that try to separate church and state. (see http://www.wvinter.net/~haught/Koran.html)
In other times and places, integration of church and state was the norm. It still is in many nations. There's a reason for this: Running a country where citizens and voters and even elected office holders may practice any or no religion complicates things. Running a country is much easier when there is a state religion and when government law and religious law are one in the same. It's simpler.
It is only by subordinating the kingdom of heaven to the kingdoms of this world that Christians and Muslims can ever live in peace with one another. So every time you meet a so-called "moderate Muslim" who hasn't declared jihad on you, be thankful for compromisers and hypocrites. If not for hypocrites and compromisers who practice a diluted form of their religion so they can acquire material goods here on Earth rather than stockpile rewards in the next life, you couldn't get to work in the morning because of all the car bombs and exploding jihadists.
And since everybody else has weighed in on this, allow me: President Obama had to defend the Muslims' right to build a community center near ground zero because, as much as it may annoy members (and panderers) of the majority religion, this nation does not have a state religion and only those who disagree with its founding principles or flunked 9th grade Civics think it's OK to discriminate against people who practice unpopular religions - even religions that, if practiced in purity, are a threat to America.
Thank God for the smorgasbord believers who don't practice all that jihad or all that Old Testament smiting and slaughter of unbelievers and infidels. Imagine what a mess America would be in if religious people actually practiced what their holy books tell them to practice.