atheist president

When looking at the polls for who the people America would vote for it is clearly stated that those who are atheist would come last. I wonder why this is. Why do people continuously put religion or in this case lack of religion at focus. Does it really matter if a person has a religion or not? Does having a religion or lack of religion make a person any greater or lesser of a president? I personally think not. When I think about myself and my religion, I do not think my religion really creates my opinions I have about politics. In the Gallup poll , atheist came dead last and surprisingly homosexuals and mormons were ahead of atheists. Again why can not the people of America understand that voting for a President should not have anything to do with what kind of religion the person is. Being a hopeful person, I am going to think that this will change someday.