Atheists does not mean they are irreligious. However, this is what we associate them with ,irreligious. It simply mean no belief in the existance of god.
So I would classify Dawkin irreligious atheists. However Dawkin and his followers are what I classfiled as willfully ignorants, BS spouting group of people. I would lump them together with creationists who oppose evolution.
On the subject on the meaning of life...and of course god.
We wonder, we think, we philosophize, so therefore there are inherient meaning in the universe.
We devise scientific theories and laws, so therefore there iare some truth in the universe.
Because of our search for the truth, therefore God exists.
I must admit, belief, disbelif, or agnostic about the existance of God does not change our lives dramatically unless we define God and the belief system in such a way that it dramatically impact our lives.
I choose to believe in god.