I an understand a person being agnostic. That is believable. But atheism is about absolutes just like other faiths.
Anyway, it is a known amongst Atheists that some are militant and then why would the be militant or maybe a more descriptive term is a zealot.
“Militant Atheism”...Sounds more like a general lack of respect for others, comparable to the Westboro Baptist Church and their “in your face”, out-in-the-open brand of disrespect.