I went ahead and looked up the definitions for both of the words.

They are both worded in such a way that you can in fact argue it is a Religion in the sense that Jorick describes.
But you can't claim an atheist is religious if they are the kind who simply lacks belief.

[quote=Jorick]However, there are plenty who do not believe in deities but do not believe that they absolutely do not exist; this is agnostic atheism, colloquially known simply as agnosticism, and it is not a religious belief because it is in truth the absence of belief. These types of atheists tend not to have beliefs about the cause, nature, or purpose of the universe because they take the stance that it is impossible (whether permanently or just currently with our limited understanding and technology) to understand these things, that they are so far above human ken that it would be foolish to pretend to have the answers. This is the lack of beliefs stance that cause most atheists to call shenanigans on people calling atheism a religion, because this is the stance that most atheists (at least in my experience) actually take.[/quote]

I'd fall into this category.
My posts on Religion might imply otherwise, but my issues with Religion is the blind faith/following of a God without proof and evidence.
The specific Gods of the specific religions in existence are not based on any real evidence, in fact claims by them can be dis-proven through science so it's safe to say no worshiped god exists.

But to say there is no God period?
There is no proof for it so it would be unwise to treat that notion as any kind of fact, but it is still potential, and without knowing any details (and assuming it is not infinite and all-knowing, otherwise we can disprove it again already) we can't make a sure judgement on it. So for all intents and purposes, I reject the created gods of today, but do not reject the possibility of there being a god in existence at all. But will not be living my life at all as if there is one until proper evidence shows itself.

As for the Agnostic bit.
Agnostic simply means unknowing. Although culturally it's used to define atheists open to the idea of a God (or outright believe a god like entity) it is in fact a false usage of the word.
In practice, Agnostic's can also be religious, as long as they admit to not knowing something. For example.

Fundamental Religious: My God is true, and there is nothing you can say or show to change it!
Agnostic Religious: I believe in God, but I do not know for sure. 
Agnostic Atheist: I do not believe in God, but I cannot say for sure there is a God or not.
Fundamental Atheist: There is no God, and there is nothing you can say or show to change it!