Namaste all,
for informational purposes only...
the term "Hindu" and thus "Hinduism" are terms that the British invented to describe the various religious praxis of India. as such, there is no religon called "Hinduism" per se. though, as with many derrogatory lables, they have adopted the term for themselves and thus, in the modern parlance, they denote themselves as Hindus.
generally speaking, the actual religion that they practice is called Sanatana Dharma, when we are speaking of the Hindus.
that being said, there is no one, single, overarching philosophical view that Hindus adhere to, though perhaps the most influential philosophical view that they have is called Vedanta. nevertheless, there are several philosophical views and thus, it requires a bit of specificity to get to what we are discussing.
further, Sanatana Dharma adherents are, in fact, Monotheists. they do not worship multiple gods. Shiva, Vishnu, Kali et al, are called Avatars and they are Avatars of the One, which is called MahaBrahma. Max Muller, for those that know, actually coined the term "Henotheism" to describe the nature of worship found in the Sanatana Dharma, though i tend to think that is more a product of his cultural view rather than a facet of Sanatana Dharma practice.
the interested reader is directed to:
www.hindunet.org for more information.