"If anyone has any doubt Obama is Muslim," writes Where's the Birth Certificate? author Jerome Corsi in a Facebook blurb announcing his latest hit-job, "read this article. He has worn for 30 years a ring with a face in Arabic script reading 'There is no God but Allah' the first half of the Shahada, the only prayer a person needs to recite to convert to Islam."
As you can see in the graphic above, Corsi purports to discern Arabic writing on the ornamental surface of Obama's ring.
I have a high-resolution image that says otherwise.