Okay, Hinduism is not actually a religion. Just thought I'd clear that up. A Hindu was one who lives in the Indus Valley Civilization, near the Indus river. They were the most advanced people in the world (we invented the sewer system, bitch!). They had many different religions that were very similiar, such as Advaita.
These religions were actually monotheistic. God is one but exists in different forms. You can pray to one form for strength and protection, and pray to another form for wisdom and knowledge. It keeps things simple. Each form has a female counterpart, but once again, these are simply incarnations. There is only one God. When you pray to Vishnu, you're just praying to God. When you pray to Durga, you're still praying to God.
The religions from the Hindu civilization have been merged to form the religion we know today as Hinduism. Those who are Hindus by blood are the descendants of this great civilization. Those who convert aren't, but they're cool anyway.
Hindus pray in temples. The 'dot on the forehead' is known as a bindi. It's there for medical reasons, actually. Those really old scientists knew that that place just above where your eyebrows meet is also an important place for the nerves in your brain.
"ROFLMAO!!!! ThAT bRoWn Gai iS a HiNDOO!!!!!" <---this is incorrect. Not all brown people are Hindus.
jason styXxX is an asshole.
Hindu: Ewwww of course not! Who told you that?
Non-Hindu: Some weirdo on UrbanDictionary.
Hindu: Well please don't believe hiim!