In a November 2010 speech, Obama pretended to quote the U.S. national motto, "In God We Trust." I guess he couldn't bring himself to say God, so he mistakenly said our official motto is "e pluribus unum." When Obama gave the traditional Presidential Thanksgiving Day address in 2011, he again failed to mention God. It's not clear who he was thanking on this uniquely American holiday, but it certainly was not God.
Listen to the radio commentary here: