Well, we have the answer now for why Barack Obama continues to play at being a Christian, though dripping with contempt for the church in his actions and policies.
Pew Research Center asked people to rate religions. Turns out that black protestants take a very dim view of atheists. In fact, only 30% of black protestants have favorable views of atheists. The President has needed black voters to support him. If he goes full atheist, he’d see a dent in that support.
Interestingly, atheists hold Buddists and Muslims in higher esteem than they do Christians and Mormons. That also explains Barack Obama and his Administration.