As far as I can tell, these were the main points of Mitt Romney's Big Speech about being a Mormon candidate for president:
1. I will not talk about the tenets of Mormonism. Except for those tenets which closely resemble fundamentalist Christianity.
2. The President swears an oath to support the Constitution, not the Bible. But he swears that oath on the Bible.
3. Religious tolerance is key to the American character. And secularists are attempting to ruin everything by establishing a "new religion" in America, and this must not be tolerated.
4. The Constitution expressly forbids a religious test as a condition of holding office, which is part of what keeps us free. And you can't have freedom without religion, which is why atheists are not fit for public office.