Another similar belief would be that Jainism, Buddhism and Sikhism are merely Hindu sects, but I think that would be false.
This is commonly held to be the case by Indian Muslims. (It may be that many Hindus also feel this way, but I don't know that firsthand.) I don't typically express this opinion because it's normally seen as impolite, but I don't think it's wrong. The term "Hinduism" encompasses religious systems sufficiently diverse in themselves that picking out certain strands and labeling them as not Hindu feels arbitrary.
I have a Sikh friend who says this is a common Hindutva trope. But generally the definition of Hinduism is acceptance of the authority of the Vedas.
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