Thats been my guess. Europe has seen first hand, for centuries, what blending church and state can do, and how more often than not it does tend to be a failure and severe violator of human rights. Tons of Americans, on the other hand, where history doesn't yet know the depths of a theocratic hell, see their rights as given and protected by god.
To me, the moment you allow religious rules to guide how we are suppose to live, it's like going down a bad/dark path.
For instant in Denmark almost no childcare institutes serves pork anymore, which is largely if not solely because of muslims. To me that is absolutely ridiculous, I don't mind them not serving pork, if it were due to some sensible reason, but it is almost purely, if not completely driven by religion. And to me it's perfectly fine if muslims do not want to eat it, then serve a second dish, but that is up to them. But in Denmark eating pork is very traditional, we have a lot of dishes which is based on pork, because of the cold climate we live in, so it goes way back.
Stuff like that annoys me, because suddenly you have religious ideas influencing what you can do and what you can't do, and as an atheist that think all of it is utter nonsense, something like that just doesn't fly with me, even if its something as minor as this.
I don't know if religious people really understand how atheists feel about stuff like this. But none of these religions have been able to provide evidence for whether or not any of this is true or not. And despite that, they haven't provided even a remotely good reason for why me or any other atheists should care about their rules... nada, nothing!!!
So even after 2000 years we have no reason for why any of this should be considered true, except that some people feel like it ought to be.... well, Im sorry but I really couldn't care less about that. Yet atheists have to comply to certain rules to not offend these people. That is bull****, believe what you want, live how you want, but don't force unjustified beliefs and rules unto others, if you can't provide any good reasons for why it should be the case.
And trust me, even if the US ended up with a theocrazy, it would take about a month before the Christians would get in a fight about, which interpretation of the bible is correct. And whether or not creationism should be taught in school or not. The US would fall so far behind in education as they would constantly have to try to fit whatever new discovery was made around the world into the creationist nonsense. Muslims and jews would feel that they weren't being heard, so they would demand equal rights as well, while the atheists would shake their heads and keep asking for evidence, until they were finally silenced or had moved to another country.