Monotheism is an extremely recent development in human history. Even the old jews were polytheists until they started worshipping only yehovah, hence started the judeo-christian monotheism. And allah used to be one of many arabic gods before mohammed and his soldiers killed everyone who tried to oppose his totalitarian doctrine (that coincidentally DESTROYED) north-indian culture.
As far as hinduism is concerned - advaitic hinduism (adi shankara)worship many gods and is hence polytheistic in a way, but all the gods are the manifestation of ONE beyond all names and hence advaitic polytheism is also monism (only Brahman is real, "mono - one"). But Brahman is not "God", because gods are supernatural beings, that's why god has a plural - gods, but Brahman or Consciousness or Universal Awareness or Absolute Reality have not, so it would be better to use these terms for Brahman and not God (beside everything else the word god is related to the world good, meaning a god is beneficial being as opposed to demons, while Brahman, unlike Gods is beyond all dualities).
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“There is neither creation nor destruction, neither destiny nor free will, neither path nor achievement. This is the final truth.” Ramana Maharshi
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