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 Allah's "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. Hence, it was not a new religion brought by Prophet Muhammad (PBUH) I 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 lslam was not decided upon by later generations of man. It was chosen by Allah Himself and clearly mentioned in His final revelation to man. In the final book of divine revelation, the Qur'aan, Allah states the following:
"This day have I perfected your religion for you, completed My favour upon you, and have chosen for you Islam as your religion". (Soorah Al-Maa'idah 5:3)
"If anyone desires a religion other than Islam (submission to Allah (God) never will It be accepted of Him" (Soorah Aal'imraan 3:85)
"Abraham was not a Jew nor Christian; but an upright Muslim." (Soorah Aal'imraan 3:67)
Nowhere in the Bible will you find Allah saying to Prophet Moses' people or their descendants that their religion is Judaism, nor to the followers of Christ that their religion is Christianity. In fact, Christ was not even his name, nor was it Jesus! The name "Christ" comes from the Greek word Christos which means the annointed. That is, Christ is a Greek translation of the Hebrew title "Messiah". The name "Jesus" on the other hand, is a latinized version of the Hebrew name Esau.
For simplicity's sake, I will however continue to refer to Prophet Esau (PBUH) as Jesus. As for his religion, it was what he called his followers to. Like the prophets before him, he called the people to surrender their will to the will of Allah; (which is Islam) and he warned them to stay away from the false gods of human imagination.
According to the New Testament, he taught his followers to pray as follows: "Yours will be done on earth as it is in Heaven".