You can basically form religion into 3 sub classes. Monotheism (1 deity), and polythiesm (multi deities), and atheism (no deity)
Islam is strictly Monotheist, along with Judaism. Christianity/Catholicism in a way is monotheistic, if you discount that they consider 3 as 1.. which is paradox anyway....
Hinduism is polytheistic.
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Muslims have 5 pillars.
1. Is to declare that there is only 1 God and that Muhammad is the last messenger of God
2. 5 Daily prayers with out bodies facing the spiritual home of Islam, Mecca, in Saudi Arabia.
3. Fasting - during the months of Ramadan, and other traditional times, where we fast only during the time of daylight hours.
4. Charity tax. It is set as a minimum of 2.5% of your annual profit, after all of your basic needs are taken care of.
5. a once in a lifetime pilgrammage to Mecca, where we emulate the Prophet in returning to the birthplace of Islam, where the first house of worship stands, the Kabah.
The 2 main groups of Islam, the Sunni and the Shi'a are very much the same in respect to the beliefs. The differences are really only political leadership or Islam after the death of the Prophet. The Shi'a believe that Ali, should have become the leader of the Muslim's, instead of the way it happened where Abu Bakr, the great companion of the Prophet, and one of the first reverted Muslims became the leader, or Caliph, which is what the Sunni's follow.
Please note, I am not affiliated in anyway to any extreme groups, and do not consider myself a terrorist, or hyprocrite. I am advocating my religion as #1; if anyone Muslim disagrees with what I write, ie.. they find falsities in my posts, please comment, so that I can change the post and learn. However, if any non-Muslim disagrees in regards to actual facts of Islam then i will endeavour to explain to you further why this fact is a fact.
That should be enough for now.
Salam! (Peace)