Islam is the religion that is based on the 5 pillars. these 5 pillars are (1)kalma(toheed) (2) namaz (3)roza (fasting) (4)haj (5)zakath Refer to related question below for more information on these 5 pillars.
The Five pillars are ,Belief ,Prayer,Charity,Fasting and pilgrimage.These are the 5 pillars of Islam.Different rules apply for each of them.
Islam religion
because they must follow the 5 pillars in order to be a Muslim
Islam
If you mean the five pillars of Islam, then they are not physical pillars. They pillars of the fundamentals of the Islam religion. they are not bound by places.
The five pillars of Islam are the basis of Islam religion. Denying any of these pillars intentionally expells the Muslim from Islam. That is why it is important for any Muslim to follow these five five pillars very closely. Refer to question below for more information.
Muslims do not worship the 5 pillars of faith. The 5 pillars are the foundation of the Islamic religion. The first one is declaring that there is only one God, and that Muhammad (peace be upon him) is His messenger. The second is praying 5 times daily. The third is fasting in the Holy month of Ramadan. The fourth is giving charity to the needy, and the fifth is making Pilgrimage to the first house of God ever built (Kaba in Mecca).
Islam religion per Quran God revelation to prophet Muhammad through the angel Gabriel (Jibril). Refer to related question below for more information.
Hajj and Zakat .
Because the five Islam pillars are the basis of Islam religion. The five pillars represent the basic practices for any Muslim. Denying any of these pillars intentionally and knowingly by any Muslam brings him/her out of Islam. Refer to question below for more details.
Its one of the 5 Pillars their religion is based upon 1. profession of faith 2. Ritual prayer 3. Fasting during ramadan 4. Charity 5. Pilgrimage to Mecca Their is a Wiki on the five pillars of islam http://en.wikipedia.org/wiki/Five_Pillars_of_Islam