One who adheres practically to the 5 Pillars of Islam and professes the belief in the 6 Fundamental aspects of faith. one can become a Muslim by uttering; “Ashadhu An Laa ilaha illa Allaah, wa ashadhu anna Muhammad ar-rasulullah.” This means, ” I bear witness that no deity has the right to be worshipped except Allaah and I bear witness that Muhammad is His servant and Final Messenger.”
All Prophets & Messengers came with the same message (i.e. worship the Creator, Allaah). Is there a doubt that these Prophets & Messengers did not submit their will to the Creator? Allah answers in the Quran: “Abraham was neither a Jew nor a Christian, but he was a true Muslim and he was not of the polytheists” (3:67).