Among the Trustworthy Facts™ proving Barack Hussein Obama II aka Barry Soetoro's Muslimosity:
There are a handful more, including "Obama's background, education, and outlook are Muslim" (whatever that means) and this quote "The United States has been enriched by Muslim Americans. Many other Americans have Muslims in their families or have lived in a Muslim-majority country - I know, because I am one of them." Which proves that Obama is one of those Americans... who has Muslims in his family. So there.
As best I can tell, Obama's deep and abiding Muslimosity is proven by his lack of outward hostility toward Muslims. That and he's read Fareed Zakaria and Malcolm X. Though by that definition, I'm Muslim too. (Oh, and psssst, Conservapedia, just FYI, Islam and the Nation of Islam: not the same thing.)
The site never quite details why the issue of Obama's religious affiliation is bad or important or even relevant. But maybe that is supposed to be a given. He's not white, that much we know, so maybe it's best just to keep an eye on him.
I swear I could get lost in Conservapedia (The Trustworthy Encyclopedia™) all day. It's hilarious and mind-boggling and surreal all at the same time. As an example, Conservapedia is citing Pravda to prove Obama is Muslim. Pravda! Jebus, I guess the Cold War really is over.