Researching Sikhism where I read that they were both particularly similar.
Some consider Sikhism to be [originally] a branch of Hinduism; including Sanatana Sikhs. I favor this view. Schisms have run deep here though.
Who founded the Hindu faith, or in other words, how did it originate?
Difficult question.
I will pick out three main trends {of memetic inheritance, if you will...] which run through and compose Hinduism's varieties.
1. Vedic brahminical tradition - brought forth by the priestly caste and codified in the Vedic schools of thought - śakhas, each oriented around particular recensions of a particular veda - the fourth veda coming quite late. Main feature: yajna (esoteric sacrifice)
2. Animistic/shamanistic ritualism and internal alchemy codified in more modern times in the tantras/agamas, but likely predating the Vedas Main features: adorative worship, often nondual; internal alchemy
3. Shramana: self-reliant tapas & brahmachari. Main feature: yoga.
Both #2 and #3 exist somewhat outside the orthodox social structure but have had tremendous influence, becoming the norm in diluted form, admixed with #1.
We can find all 3 of these trends in virtually any of Hinduism’s many splendored branches.
We cannot date #2 or #3 with any certainty, save to hazard from archaeological evidence that solitary meditating God(desse)s are depicted over 5,000 years ago. The Vedas are perhaps 500 years thereafter - but we can’t really date them either, as they were oral long before being recorded.
The Vedas came from the Ṛṣis. Ṛṣis are ancient sages who’d achieved knowledge of God and sought to not only pass on their knowledge but organize Indic society around this knowledge; the result was Vedic Brahmanism.
In Abrahamic faiths it is common to find such ideas that the scripture is the perfect, inerrant word of God, and authored thereby. Likewise, the Vedas are regarded as Apauresheya - without human authorship. As with the Christian idea of Logos, the Vedas are held as existent before manifestation of the world.
But here the Vedas go a step further: the Vedas are not only coexistent with reality, they are in fact the parent of reality; the Vedas are records of the invocations by which reality was originally made manifest, and as such, wields enormous influence over that reality.
What is your view on God and where do the deities come into it, are they considered God incarnate?
I will speak only for myself; my views are a mix of advaita and paradvaita. Paradvaita (Trika) is intensely concerned with nondual deity worship.
Everything is God.
God is more than everything and everyone.
God is both manifest and unmanifest, formed and formless, subject to change and imperishable, and is not limited by any dichotomizing mode of awareness, not even to ontological categories like ‘existence’ and ‘non-existence’
Each being is God in totality.
Each being is composed of every other being.
We are all one.
There is a smooth continuum of manifestation from spirit/consciousness to matter.
All provisionally inert material in lower-dimensional reality is in fact profoundly aware spirit.
Perceiving is being when performed in God-consciousness; whatever one ‘sees,’ one is. Rather, one sees ‘it’ by virtue of being ‘it.’
The correct attitude to cultivate is one of absolute adoration, reverence and worship to all apparently limited structures of relativity - things and persons, as God/Self.
So what are deities? In my view, they are (amongst other things) the ferrymen between phenomenal and noumenal shores.
Deities are anthropomorphic, conscious representatives of cosmic & cognitive forces. Earth, sky, sun, moon, space, vital force, intellect, all-pervading essence, etc.
A specific deity is a particular composite which emphasizes a given characteristic, or set of characteristics. Knowledge, speech, fear, etc. - anything that can be conceptualized, and therefore made a cognitive element, can be deified.
Assemblies of deities are viewed as composing all reality, like cells in the body of God.
Each deity is equally and ‘secretly’ nirguna brahman; unmanifest brahman without attributes or, even more importantly, attribution, uncircumscribed by time, space or any mode of manifestation.
Identifying the self with the deities (who compose the ecosystem of the Self) causes this bridge from the phenomenal to the noumenal.
For example, I perceive a flame. I infer the presence of the appropriate deities composing that fire and focus my awareness as oblation to these deities. I am them, without separate subject, object or mode of knowing. Now fire is no longer a veil, an obscuration of pure awareness, it is no longer cognized as a separately existing object. A veil has become a lens.
I would say the most important characteristic of Hinduism is that God is conceived of in gendered dualities which are either brought into absolute harmony or resolved entirely.