Monotheism: The faith of One God, who is Superior
to all His creations and creates, protects and dissolves the
entire universe and all the created beings. Here the "God"
is different from the Human Soul. Visishta-adhvaita and Dvaitha
follow this path. Here the Divine Soul - "Paramaatma"
is identified as separate from the Human Soul - "Jivatma".
To a large extent, Advaitha also follows this path, except that
here the Jivatma is a part of the Divine Soul or Paramatma and
is capable of a merger with the Divine ultimately, so somewhat
Monism: This is the ultimate faith of a Yogi who
has understood the true Nature of the Supreme and the true Philosophy
of Hindu Dharma. Here, the Paramatma and Jivatma appear as the
two aspects of the One and the Same Supreme Truth and are Non-differentiated.
They appear in their intuitive mind as just two aspects of One
Supreme, just as all His Avatharas, Manifestations and Creations
and also of all the worlds in the Universe are different aspects
of the same Self in various forms and shades.
the practice of elevating one Deity as a "Superior"
for a particular ritual while keeping other forms at a lower
level and at another ritual or function raising another one
etc. Ancient European Religions used this method and possible
some times ancient Vedic worship also had such practice.
Polytheism: This is the level of the lower most form
of the Faith and also similar to the practice of Hinduism as
practiced according to Agamas and Temple worship where, we see
"God" as in several forms to serve different purposes
as the need may be and believe in different Gods, similar to
the beliefs of Hellenic faiths [Greek], Druids and Pagans. Here
Hinduism differs in that as we evolve in our thoughts, the different
"Gods" slowly merge in to different aspects of One
Supreme. Please visit in my site the topic "Concept of
God in Hindu Religion".