The followers of islam are called the Muslims. The God is the god of Abraham(allah) The (God of Abraham is the same for all 3 relgions)
During the annual pilgrimage
Muslims walk around around the Ka'aba in a counter-clockwise direction. Once a year, pilgrims from all over the world, travel to the Kaba to perform the annual hajj.
The Kaba is a cubical structure about 60 feet high and 60 feet wide. Muslims do not worship the Kaba itself. Rather, it acts as an important unifying point for believers around the world. It is in Mecca at the Kaba that Muslims feel the connection of heaven and earth. It is for this reason that the Kaba is considered to be the holiest site in Islam.
The Quran basically teaches what is right and wrong, or halal and haram, in the muslim faith. It dictates the 5 pillars of Islam, it tells the stories of the various prophets throughout history, it offers explanations and insight into the islamic faith. Its the rule book for the islam relgion.