Jerry Coyne admitted that his speculations about Obama being an atheist were mistaken. However, we really don't know if Jerry was wrong or right. Asking what religion a politician is is like asking what color a chameleon is.
What was more interesting about Coyne's post were his assertions that various statements that Obama made were "factually incorrect," such as the Exodus from Egypt and the Resurrection of Jesus. True, most scholars think that the Exodus didn't happen, but there is a growing list of archaeologists who think it did. As for the Resurrection, I'm curious what Jerry's proof is that it is "factually incorrect."