Michael Moore is a filmmaker.
Michael Moore is not an atheist (that we know of) but he has recently argued very similar to how you would hear atheists argue, the things of concern for them. When on HBO's Real Time with Bill Maher he spoke to Richard Dawkins and about the power they've had on culture. He said "the fact that you guys have called bullshit on religion over and over again" has made atheism acceptable.
He later went on to rail against the Christian right and their misuse of power over the last few decades.
"Since 1980 the policies of this country have been run by the Christian right. They took over and they turned this country into the dark ages, and we are so far behind now: science, education, healthcare, everything." - Michael Moore with Bill Maher on Real Time 10-25-13.