Generally, Hinduism is based on controversial postulates – monotheism (recognition the one god), theism (existence of the monotheistic God created the world and continuing his actions there), polytheism (existence of several gods, having own sphere of “responsibility”, having own characters, communicating with other gods), panentheism ( world exists in god, however, god doesn’t solve in the world – synthesis of ideas belonging to theism and pantheism), pantheism (equality of god and nature), monism ( existence of the general law structure of the universe absorbing in the final result seemingly different kinds of being or substances), and even atheism (so-called nirishvaravada – the common name of Indian philosophical and religious movements that deny the existence of Ishvara (the Creator of the world.)

Probably, the legal definition of Hinduism given by the Supreme Court of India in 1966 will help to understand this sophisticated and controversial religion. With the updates, as amended July 2, 1995, it includes 7 basic attributes:
1)"Respect that has to be given to the Vedas - the highest authority in religious and philosophical matters ";
2) Presence of tolerance and respect for another point of view, which may follow from the recognition that truth can be many-sided;
3) Recognition of the space " great world rhythm " – the hugest periods of creation, preservation and destruction of the Universe, which are following one after another in the infinite sequence and the idea of which is recognized by all six major systems of Hindu philosophy;
4) Belief in rebirth (reincarnation) and the previous existence of the soul (which is the spiritual essence of the individual);
5) Recognition that the exemption (from the " wheel of reincarnation ") can be achieved by the various ways;
6) Recognition the "idolatry, worship and the negation of a visual image of the gods" as having the "equal" opportunities for believers;
7) Understanding that, unlike other religions, Hinduism is not associated with the recognition of a particular set of philosophical tenets.

As you can see – even if Hinduism consists of a huge conglomerate of theories, views, practices, which were arisen in different time – more or less early, the similarities in this religion are very clear and clearly visible.

Thanks for the post, I would also add that Hinduism is the third largest religion.

Also, there are some differs from Christianity, Hinduism doesn't have:
- there is a single founder;
- particular theological system;
- just one idea of deity;
- a single sacred book;
- one system of ethics;
- one main religious authority;
- the concept of a preacher;