Why are people still repeating that urban myth, ad-nauseum, that Obama is a Muslim?

Because he is still mysterious to Americans. We honestly don't know much about him still. I honestly think he is not a Muslim, but rather he doesn't agree with America Exception ism. And I see that Muslims don't like America, and this is where people get the connect. I do believe in once point in his life he tried Islam, and may have liked it, but knew he couldn't get up in politics by being Muslim.