Islam is not a religion of an ethnic group or a specific nation, rather it is the religion for all mankind. Some of the teachings of Islam were already preached by the earlier prophets Abraham, Moses, Jesus, etc., peace be on them. Islam was perfected at the time of prophet Muhammad, peace and blessings of God be on him, as a favor unto mankind by God. Muslims believe that God speaks to His chosen servants through the process of revelation. It is through this process that spiritual knowledge and wisdom is given to man by God.
Revelation can be of many kinds.
Revelation may be prophetic in nature and bring knowledge of future events. Revelation may bring great insight into matters of material or spiritual nature. The nature of revelation varies according to circumstances and the spiritual station of the recipient. Muslims believe that of all revelations and divine communications, the most complete, the most perfect and the most comprehensive is the Holy Quran which contains all the types of revelations that I have just explained. Now let us turn to the person who received the Quranic revelation.