The first thing that one should know and clearly understand about Islam is what the word "Islam" itself means. The religion of Islam is not named after a person as in the case of Christianity which was named after Jesus Christ, Buddhism after Gotama Buddha, Confucianism after Confucius, and Marxism after Karl Marx. Nor was it named after a tribe like Judaism after the tribe of Judah and Hinduism after the Hindus. Islam is the true religion of Allah and as such, its name represents the central principle of God's religion; the total submission to the will of Allah God. The Arabic word "Islam" means the submission or surrender of one's will to the only true God worthy of worship Allah and anyone who does so is termed a Muslim, The word also implies "peace" which is the natural consequence of total submission to the will of Allah. Thus, it was not a new religion brought by Prophet Muhammad (PBUH) in Arabia in the seventh century, but only the true religion of Allah re-expressed in its final form.
Islam is the religion which was given to Adam, the first man and the first prophet of Allah, and it was the religion of all the prophets sent by Allah to mankind. The name of God's religion Islam was not decided upon by later generations of man. It was chosen by Allah Himself and clearly mentioned in His final revelation to man.