I don't think you can call these people religious because they don't have any common belief system of their own other than to oppose religious ones.
I disagree. Many atheists seem to be anti religious because religions often attack the foundations of the atheist's beliefs, science, logic and critical thinking.
It was Christianity that originally contradicted scientific evidence in preference to their own religious doctrine. This isn't not an opinion, this is a fact. I even recall Pope John Paul II apologizing for the Church's treatment of Galileo for his discoveries.
I think that many atheists feel it necessary to defend their beliefs when they are being attacked by religion. And as far as all the Atheists out there who may very well be against religion in general (Richard Dawkins, Sam Harris) I think they only believe what they do because the cons of religion are more tangible than the pros.
You can see war and death and prejudice and ignorance. It's much harder to see a sense of community and fulfillment and inner peace. (Especially because most religious people don't portray these qualities anymore than you're average atheist.)
I guess you could say I'm borderline anti-religion. Karl Marx was wrong about a lot of stuff, but I think he was right when he described religion as a sort of system that keeps the impoverished satisfied with their existence and keeps them from achieving a higher socio-economic status.
Have any of you ever heard of the Mandate of Heaven? It's a Taoist construct that simply states, if someone is your ruler, then they are meant to be your ruler, and if they are bad rulers the Kami spirits will remove them from power and punish them. If you ask me, that sounds like a governmental system just begging for corruption.
Also Confucianism has a similar belief systems. Can anyone guess what the two main religions in China are? Has anyone taken a close look at the Chinese government lately? I believe there is a connection.
I have a feeling many of you would be more likely to agree with critiques of religions that aren't your own but I view pretty much all religions as the same.
Except maybe Buddhism because Theravada Buddhism is a lot closer to a type of philosophy than it is a religion. The original Buddha was against the worship of false idles, and only reluctantly agreed with the idea of reincarnation. He was also an admitted atheist.
I've also always found the Hindu/Buddhist beliefs a lot more symmetrically beautiful than Judao-Christian beliefs.
They clash less with science and logic too, so thats always a plus.