WARNING: Profanity and vulgarity (NOT suitable for any age)!
There is a myth that the Buddha and therefore Buddhists are and always were Hindus. Only Hindus say this, of course, in spite of the fact that the Buddha opposed the authority of the sacred Hindu scriptures (Vedas) and the traditions, sacrifices, and customs of the brahmins.
The Buddha, a wandering ascetic unencumbered by Temple politics, taught a path that did not depend on intermediaries for "salvation." He made known the liberating truth directly visible here and now. Practitioners penetrated it and directly experienced its benefits immediately. It is said of Buddhist teachings that they invite one to "come and see."
Hindus have done the same to Mahavira, the founder of Jainism, ignoring his teaching by holding him in high esteem for his severe asceticism and support of basic Brahminical beliefs (regarding the soul, karma, the afterlife, and the role of self-mortification in spiritual purification).
Sadly, while it seems like a compliment, brahmins explain away his contrary views in all seriousness by saying that "God" in his incarnation as Vishnu was purposely trying to lead people away from the "eternal truth" (Sanatan Dharma) of the Vedas and Hinduism.
In Hinduism, the Buddha is regarded as the ninth incarnation of Vishnu following Ram and Krishna. That is obviously a real honor, even though Buddhism may not see it that way. Buddhism in fact does not believe in Gods and sees him only as an incarnation of a realized being. Nevertheless, various forms of the Buddha are worshipped in Buddhism in ways that are very similar to the worship of Hindu gods [particularly in Mahayana with its veneration of many buddhas and bodhisattvas].