When The Prophet Muhammad wife, Aisyah, was asked to described the mode of his life and conduct, she replied, "His morals are The Holy Qur'an." This book is the words of God (Allah), which consist of 114 chapter of varying length. Each chapter is made up of single or multiple revelations.
In other words, his daily life was a true picture of The Qur'anic teachings. He was an embodiment of all the virtues which have been enunciated by The Holy Qur'an. The record of his life which shed light on his conduct as a child, as a father, as a neighbor, as a merchant, as a preacher, as a persecuted fugitive, as a friend, as a warrior, as an army commander, as a conqueror, as a judge, as a law giver, as a ruler and above all, as a devotee of God (Allah), and was all an exemplification on The Book of God (Allah). The sincerity and purity of his pious living was clearly revealed in his daily routine.
But The Prophet Muhammad only a man. He is only "the comforter" or "the spirit of truth", who would guide human beings into all truth. He shall not speak of him self, but shall speak of God (Allah) words.
If anyone has a real desire to be a moslem and has full conviction and strong belief, that Islam is the true religion ordained by God (Allah) for all human beings, then one should pronounce, that Shahada, "I bear witness that there is no deity worthy to be worshipped but Allah, and I bear witness the Muhammad is His (Allah) servant and messenger.
The Holy Qur'an is explicit in this regard as God (Allah) has stated, "Truly, the religion on the sight of Allah is Islam" (Qur'an 3:19). In another verse of The Holy Qur'an, God (Allah) has stated, "And whosoever desire a religion other that Islam, never will it accepted of him, and in the hereafter he will be in the ranks of those who are lost" (Qur'an 3:85).
In addition, Islam is the only religion prevailing over all other religions. God (Allah) has stated in The Holy Qur'an, "And to thee. We have sent The Book (The Holy Qur'an) in truth. This Qur'an confirming the scripture that came before it, and a witness over it" (Qur'an 5:48).
The Prophet Muhammad (peace and blessing of Allah be upon him) said, "Islam is based on five pillars: testifying that there is no God worthy to be worshipped but Allah, and that Muhammad is the messenger of Allah and His servant; performing the prayer (shalat); paying the zakat (obligatory charity); fasting the month of Ramadhan (shaum); and performing hajj (yearly pilgrimage)."