I wondered about that too.
What got that "Anabaptist Bishop" Ron McRae interested in where Obama was born was a quote by Sarah Obama that supposedly said Barack was a "child of the village."
He took it to mean that Obama was born in the village.
That was his evidence.
But when he has her on the phone, he asks her if BHO Jr. was born in Mombasa on the other side of the country, throwing out the only bit of "evidence" he has.
What gives?
There's a post way up on this thread that explains the origin of this part of the birther myth.
Apparently, some time in 2008, an Imam came out of the woodwork claiming to have presided over some religious ceremony involving Obama Jr. in a Mombasa mosque shortly after he was born.