Obama has admitted he is a muslim - multiple times:
http://www.youtube.com/watch?v=zpuhlAgyGwY&feature=related
He is considered a muslim by the muslim world because his father was a muslim and he comes from many generations of muslims. Sunni muslims.
He is more arab in his genealogy than he is black african.
He has bowed to the Saudi king, which signaled to the muslim world that the US is in submission.
He states he is a christian, but in the quran, it is permissible to lie to infidels if it further the cause of islam.
From wikipedia:
Obama supports the Muslim Brotherhood.
Obama is holding talks with and is funding the Taliban - those who are our enemies and have killed and maimed countless thousands of US and NATO troops.
Obama's policies are aimed to bring the downfall of America.
During obama's tenure, more money has been funneled to Kenya than at any other time - even though Christians are being slaughtered, even today.
Does obama have a secret plan to import 100 million muslims into the US after the 2012 election?
Check this out -
http://www.youtube.com/watch?v=vl-f0CjKzOY
Will the US be a muslim country by the end of obama's second term?