Having said that, this same issue was brought up when John Kennedy ran for President...could he exercise his role as a Catholic given the Catholic view of the Pope. He answered the question bac then.
Last election, in 2007, Romney answered this particular angle of attack as well in a speech about his faith.
In that speech he said, among other things:
"Given our grand tradition of religious tolerance and liberty, some wonder whether there are any questions regarding an aspiring candidate's religion that are appropriate. I believe there are. And I will answer them today.
"Almost 50 years ago another candidate from Massachusetts explained that he was an American running for president, not a Catholic running for president. Like him, I am an American running for president. I do not define my candidacy by my religion. A person should not be elected because of his faith nor should he be rejected because of his faith.
"Let me assure you that no authorities of my church, or of any other church for that matter, will ever exert influence on presidential decisions. Their authority is theirs, within the province of church affairs, and it ends where the affairs of the nation begin.
"As governor, I tried to do the right as best I knew it, serving the law and answering to the Constitution. I did not confuse the particular teachings of my church with the obligations of the office and of the Constitution - and of course, I would not do so as president. I will put no doctrine of any church above the plain duties of the office and the sovereign authority of the law.
You can find the full transcript of his speech HERE
I hate this stuff. There are plenty of good reasons to oppose Romney but his religion should not be one of them. I think it’s downright unAmerican to attack a man’s faith.