Are Iranians not Muslim?

Another interesting feature that is often revealed by the participants of Skypeland casts is the disagreement between Muslims about who is really a Muslim. Often at the start of a conversation, a Muslim will go out of his way to claim that they are all one Muslim nation and all brothers under the skin, etc. However, it often takes very little time before one Muslim is condemning another, claiming they are not "real" Muslims or even should be summarily executed. At first it was amusing, but after hearing it a few dozen times I start to sense a pattern...Ah, yes, now it all starts to become clear.