Atheist Church? Gimme a break

I heard on the news today where there is a new movement in America.  Apparently it is a spill-over from something already occurring in Europe - atheist churches.  Or more specifically, atheist mega-churches.

For real?

What a contradiction!

Definition of "atheist": 
a person who denies or disbelieves the existence of a supreme being or beings.

Definition of "church": 
a building designed for public forms of worship, esp Christian church.

Given these two definitions, what you have is a gathering of people who don't believe in anything, gathering in a building reserved for worship.  What's the point?  What are they worshipping?

Sounds to me like they just need a clubhouse.