Vivekananda is my Hero.All the questions regarding Hinduism have been answered in his books.
These are some excerpts from chapters 'Paper on Hinduism' and 'What we believe in' ,Complete Works Of Swami Vivekananda.
Polytheism:
At the very outset, I may tell you that there is no polytheism in India. In every temple, if one stands by and listens, one will find the worshipers applying all the attributes of God, including omnipresence, to the images. It is not polytheism, nor would the name henotheism explain the situation.
The rose, called by any other name, would smell as sweet. Names are not explanations.
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We reject none, neither theist, nor pantheist, monist, polytheist, agnostic, nor atheist; the only condition of being a disciple is modelling a character at once the broadest and the most intense. Nor do we insist upon particular codes of morality as to conduct, or character, or eating and drinking, except so far as it injures others.
Whatever retards the onward progress or helps the downward fall is vice; whatever helps in coming up and becoming harmonised is virtue.
We leave everybody free to know, select, and follow whatever suits and helps him. Thus, for example, eating meat may help one, eating fruit another. Each is welcome to his own peculiarity, but he has no right to criticise the conduct of others, because that would, if followed by him, injure him, much less to insist that others should follow his way. A wife may help some people in this progress, to others she may be a positive injury. But the unmarried man has no right to say that the married disciple is wrong, much less to force his own ideal of morality upon his brother.
We believe that every being is divine, is God. Every soul is a sun covered over with clouds of ignorance, the difference between soul and soul is owing to the difference in density of these layers of clouds. We believe that this is the conscious or unconscious basis of all religions, and that this is the explanation of the whole history of human progress either in the material, intellectual, or spiritual plane the same Spirit is manifesting through different planes.
We believe that this is the very essence of the Vedas.
We believe that it is the duty of every soul to treat, think of, and behave to other souls as such, i.e. as Gods, and not hate or despise, or vilify, or try to injure them by any manner or means. This is the duty not only of the Sannyasin, but of all men and women.
The soul has neither sex, nor caste, nor imperfection .We believe that nowhere throughout the Vedas, Darshanas, or Purânas, or Tantras, is it ever said that the soul has any sex, creed, or caste.
Idol Worship:
I remember, as a boy, hearing a Christian missionary preach to a crowd in India. Among other sweet things he was telling them was that if he gave a blow to their idol with his stick, what could it do? One of his hearers sharply answered, "If I abuse your God, what can He do?" You would be punished, said the preacher, "when you die."
"So my idol will punish you when you die," retorted the Hindu.
The tree is known by its fruits. When I have seen amongst them that are called idolaters, men, the like of whom in morality and spirituality and love I have never seen anywhere, I stop and ask myself, "Can sin beget holiness?"
Superstition is a great enemy of man, but bigotry is worse. Why does a Christian go to church? Why is the cross holy? Why is the face turned toward the sky in prayer? Why are there so many images in the Catholic Church? Why are there so many images in the minds of Protestants when they pray? My brethren, we can no more think about anything without a mental image than we can live without breathing. By the law of association, the material image calls up the mental idea and vice versa. This is why the Hindu uses an external symbol when he worships. He will tell you, it helps to keep his mind fixed on the Being to whom he prays. He knows as well as you do that the image is not God, is not omnipresent. After all, how much does omnipresence mean to almost the whole world? It stands merely as a word, a symbol. Has God superficial area? If not, when we repeat that word "omnipresent", we think of the extended sky or of space, that is all.
As we find that somehow or other, by the laws of our mental constitution, we have to associate our ideas of infinity with the image of the blue sky, or of the sea, so we naturally connect our idea of holiness with the image of a church, a mosque, or a cross. The Hindus have associated the idea of holiness, purity, truth, omnipresence, and such other ideas with different images and forms. But with this difference that while some people devote their whole lives to their idol of a church and never rise higher, because with them religion means an intellectual assent to certain doctrines and doing good to their fellows, the whole religion of the Hindu is centred in realisation. Man is to become divine by realising the divine. Idols or temples or churches or books are only the supports, the helps, of his spiritual childhood: but on and on he must progress.
He must not stop anywhere. "External worship, material worship," say the scriptures, "is the lowest stage;struggling to rise high, mental prayer is the next stage, but the highest stage is when the Lord has been realised." Mark, the same earnest man who is kneeling before the idol tells you, "Him the Sun cannot express, nor the moon,
nor the stars, the lightning cannot express Him, nor what we speak of as fire; through Him they shine." But he does not abuse any one's idol or call its worship sin. He recognises in it a necessary stage of life. "The child is father of the man." Would it be right for an old man to say that childhood is a sin or youth a sin?
If a man can realise his divine nature with the help of an image, would it be right to call that a sin? Nor even when he has passed that stage, should he call it an error. To the Hindu, man is not travelling from error to truth, but from truth to truth, from lower to higher truth. To him all the religions, from the lowest fetishism to the highest absolutism, mean so many attempts of the human soul to grasp and realise the Infinite, each determined by the conditions of its birth and association, and each of these marks a stage of progress; and every soul is a young eagle soaring higher and higher, gathering more and more strength, till it reaches the Glorious Sun.