What they consider is that an atheistic material universe is the default theological position.
Since it's a theological position, it's as religious as anything atheists complain about.
They don't profess that they consider the material world their god, but that is the result.
I took rhetorical liberty in my comment. In actuality, they believe themselves to be the equivilant of gods, and think that man answers to no other Being in the Universe other than himself.
By my statement, "atheists see the material world as 'god'", I'm simply alluding to the fact that they see material existance as the ultimate experience, and material gain as the ultimate endeavor.
What they consider is that an atheistic material universe is the default theological position.
Since it's a theological position, it's as religious as anything atheists complain about.