I guess it depends how you define a "religion". In the case of Islam, some Muslims consider certain portions of the Hadith to be sacred law that must be followed absolutely while other Muslims reject those portions entirely. Therefore, you have two groups of people who are "Muslims" but follow different sets of religious rules. Are they still part of the same religion?
It's probably just semantics. The more useful discussion is a) what do people believe, b) how many people believe that, and c) is that a good doctrine for people to follow.
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