Are all atheists this ill-informed about religion?

[The Grand Nudger]

Rather, people who affirm Christianity often wage war for sociopolitical or economic reasons, and use the banner of Christendom as a convenient cultural icon. This says nothing about the militancy of Christian belief so much as about culture.

It says, as you've clearly laid out here, that christianity does not provide an adequate moral standard.  It says this even as you attempted to craft an excuse that ignores reality.  That says something as well.

Now, back to reality;

-Fact: Schisms are schismatic, they don't call them schisms on account of their conformity.   

They exist, their differences are important -if not to you, to them-.  That you would diminish the convictions of their faith and how they act upon that faith is a further example of precisely -how- this situation is sparked to begin with.  You are dismissive and intolerant of their schisms, first denying that they existed, then the importance of their differences if they did exist, and now denying their clear history of action, rejecting their self declared and well documented convictions and justifications.  You've invented ulterior motives to question the character of those convictions, effectively, a test of religiosity in absentia.  

Congratulations, it's schismatics such as yourself who've left other schismatics so frustrated and marginalized throughout history that violence appeals to them as a method of recourse, as a way of being heard and effecting change.  I might get cranky if people told me I didn't exist, that the convictions of my faith were unimportant, or that I was simply using that faith to aggrandize myself, or pursue a "baser" goal........