The term "Atheist Masterpiece" is meaningless. A masterpiece, whether done by a theist or atheist is just a thing, not an opinion or position,
Masterpiece
The Masterpiece was created in 2007.
the isenheim masterpiece
An English atheist is an atheist from England.
Masterpiece was written by Elise Broach.
The Greek word for masterpiece is αριστούργημα.
Masterpiece has three syllables.
Aristotle's Masterpiece was created in 1684.
Screaming Masterpiece was created in 2005.
When I Paint My Masterpiece was created in 1971.
Masterpiece of Bitterness was created in 2005.
Masterpiece is a noun.