Why are the 5 Pillars of Islam so important?
Along with the 6 pillars of faith of Islam the 5 pillars of Islam form the basic framework of Islam and outline the main requirements for a Muslim to gain entrance to Jannah (heaven) in the after-life.
They are the basis of Islamic belief. The 5 Islam pillars are like the pillars of a building. As no building can stand without pillars, also Islam does not stand without the five pillars.
Because you cant be a muslim if you dont follow all of them. They are rules to live by and a faithful muslim will act on all of them