The fact that you are born into your caste and cannot change it until reincarnation (based on Karma and Dharma) is based on the basic laws of Hinduism.
yes it is
if you die you can have rebirth into a higher caste system
AUM (or om) is a sound used in Hindu meditation, and karma is a measurement of personal virtue that is an important part of Hindu spiritual beliefs, so both of these are aspects of the Hindu religion.
The Hindu gods are all aspects of the god Brahma. They represent the main principles of Hindu religious beliefs, such as creation and prosperity.
Reincarnation
how does ahimsa relate to other hindu beliefs
Hindu beliefs about rebirth and karma are tied to the caste system. The Hindu people believe that a persons caste is a result of karma and that deeds in past lives are responsible for ones current position (in the caste).
the beliefs are not real
writings about Hindu beliefs
The Hindu's symbol represent the unmanifest and manifest aspects of God.
Being Hindu
That depends on the Hindu that is being talked to. There are some Hindus that are atheistic in their beliefs but refuse to be called atheits. There are Hindu's that are fundamental polytheists/monotheists in their beliefs. There is not really a "Hindu" argument for/against relgious experiences.