Vishnu, Krishna, Braham, Hannuman, etc., etc. That doesn't sound monotheistic to me.
I once spoke to a Hindu priest who informed me that many of the other gods are mostly aspects or avatars. The main gods are three ....Brahma, Visnu (or Vishnu) and Siva (Shiva). Now it gets interesting ...those three gods are actually a trinity (called the 'Trimurti'), very similar to God the Father, God the Son, and the Holy Spirit (in their case, Brahma the Creator, Visnu the Sustainer, and Siva the Destroyer). The Trimurti, like the Trinity, are actually one being known as Brahman (not to be confused with Brahma, who is the Creator figure in the Trimurti). Thus, said the priest, Hindus when you distill it are monotheistic.
Thus, it is quite interesting. For instance ...Krishna is an avatar of Visnu (Visnu came in several forms, Krishna being one of the more famous ones). Deities like Hanuman, Indra or Ganesh are lower ranking gods ...think of them like 'hyper-powered' saints.
Anyways, religion is weird - all these men saying all these things (be they Christian men, Buddhists, Hindus, Daoist, etc). Personally, my personal relationship with Christ is as close to religion as I want to be.