What do you think of my reason to vote for Romney?

Your logic falls apart right in the middle of the first point. The rest of the world won't care what religion our president is. They already laugh at us for taking religion so seriously. To the rest of the industrialized world, there is no difference in how ridiculous Mormonism is to how ridiculous Evangelical Christianity is to how ridiculous Fundamentalist Islam is. So, without Point One, the rest of your scenario doesn't happen, even if it wasn't silly fantasy.