I'm not accustomed to sober, measured argumentation from Maoists, but the 21st century holds many surprises:
Away With All Gods! Unchaining the Mind and Radically Changing the World by Bob Avakian (Chicago: Insight Press, 2008).
That's right, Bob Avakian, chairman of the Revolutionary Communist Party. Regardless of what you think of the party line in general or on various matters, there is much material on this web site of interest, under the rubrics:
Atheism & Religion
I'll cite two specific pieces which appear in the book's bibliography:
"A Leap of Faith" and a Leap to Rational Knowledge: Two Very Different Kinds of Leaps, Two Radically Different Worldviews and Methods by Bob Avakian
God the Original Fascist Series by A. Brooks.
Note also this debate on YouTube:
Atheism, God and Morality in a Time of Imperialism and Rising Fundamentalism, An Exchange Between Chris Hedges and Sunsara Taylor (23 April 2008).