generally:
atheist = actively anti-religion
agnostic = don't care
I think the former makes a stink because there's actually a separation of church and state written into the constitution and they want to keep it that way
Actually there isn't. It says that the federal government can't establish a religion OR PROHIBIT THE FREE EXERCISE THEREOF. It says nothing about a state, county, or city establishing a religion. It says that an atheist can't use the constitution to prohibit anyone from practicing his religion. The constitution has been badly twisted to get where we are today.