Both Obama and atheists need a foil, someone who can be their nemesis.
Obama needs former pres George Bush to blame for all the current administration's failings. Without Bush, he has no one to deflect his shortcomings upon. In the case of the atheist, without God there can be no atheism, the belief that there is no God. If there were no God, what would an atheist be? a believer in nothingness? Since to believers, God alway is, there will also be athiests. For Obama, he has to rely on man rather than God for his excuses.
Eventually Obama must come to a point of taking responsibility for his own actions(or inaction) and stop blaming his predecessor, George Bush.