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The reason that the Obama is/was a Muslim email has any legs is that the responses to it are really to the earliest versions -- the over-the-top "radical Muslim madrassa" version -- rather than the more subtle versions that Obama received two hours per week of instruction in Islam while attending the "public" school in Indonesia while living with his Muslim stepfather.
This issue is one that Obama made worse for himself by making absolute denials that later required slight modification and in turn give his opponents the tiny bit of traction they needed to build their attack. He often tried to describe his connections to Islam as being limited to just his "atheist" father having been raised Muslim, rather than it being slightly more nuanced than that.