This example may be a bit old, but John F. Kennedy was a catholic he kept his religious life private, and seperate from government srevice.
Thus the seperation of church and state.

Other members of goverment even today feel the same way they keep their rekigious beleifs seperate from government.
Example Roevs Wade was passed by the government still in place.
Which proves not all politicians are bible thimping church goers there wear their religion on their sleeve.

If a person has a job to do,any person his mind should be on the job at hand.
Atheist or religious or whatever the person that can prefom the task that needs to be fullfilled the best would be the person best for the job.

Although it is true I don't want some rich preacher telling me how I should worship or who I should agree with.
I wouldn't want an atheist telling me that my faith in God is wrong and I should beleive in the Big Bang either.

Any elected official should recognize the right of the American people to be indivifduals that only beleive in making America a better place to live.
In my opinion this is the one beleif that should be questioned.

anythings possible but if an atheist wans to be president his best bet is to fake being christian

The same thing is true for a Christian.

If an actual practising Christian wanted to become president, their best bet would be to remain either mumchance on their faith, or pretend they are just as stout a fake Christian as all the other contenders.

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"Mankind has developed the seemingly limitless capacity for the constant reiteration of the commonplace." -- John Kenneth Gailbraith

Separation of Church and State means that the Church itself does not influence or control government and religious law is not also actual law. It does not mean that members of government cannot be religious or be influenced by their religious views, but only to the confines of the constitution.

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However, in todays soceity with the religious right wing, and the religious base increnging on politics.
The line between Religious law and actual law becomes very thin at least to the point of being questioned by those who want actual law.