No one thinks every Christian is a fundamental…

No one thinks every Christian is a fundamentalist. The most you could suggest is that all Christians in some way contribute to an atmosphere which allows fundamentalism to thrive. 

Also, I’m not sure that “militant atheist” is a coherent concept. No atheist is knocking on every door trying to talk you out of your religion, or trying to make your religion illegal. We don’t care. We just want to be left alone.