1. The very first time that Muhammad proclaimed his message to the people, he declared the following: "I am the messenger of God to all mankind and to you in particular". This means that the divine message was sent to all mankind right from the very beginning and that the Prophet never claimed that it was meant to be a religion for the Arabs alone. This is confirmed by another of the Prophet’s sayings: "Every Prophet was sent to his own people whereas I was sent to all mankind"(Related by Al-Bukhari.).
2. Anyone who reads the Qur’an can understand that it addresses all people and calls upon all mankind to believe in the religion of God. This appeal to all mankind in the verses that were revealed in Mecca, before his emigration to Al-Medina, is as clear as daylight. For example, in the verse 107 of Sura (chapter) 21 we read: "In no way did We send you but as a Mercy for all creatures". Similarly the opening Sura of the Qur’an states: "Praise be to God, the Cherisher and Sustainer of the Worlds". This was revealed to the Prophet before his emigration to Al-Madina where he established the Muslim state.
3. From the aforementioned facts we can decisively refute the allegation that the Prophet changed his plans according to circumstances. There was a gradual development of legislation, which is a normal and logical procedure. It is impossible for any person to change his customary manner of behavior, conduct, mental attitude, habits, or character overnight, since, inherent, deeply rooted customs are very difficult to eliminate. Islam began by establishing the belief in God into the hearts and minds of the people, and this was the solid foundation upon which legislation could then be established, in order to be the basis of a gradual change in the peoples’ way of life. This was the policy that was followed regarding many religious rulings and laws, such as the gradual prohibition of intoxicants, usury, and the abolition of slavery, etc. In fact, the Meccan period was a period during which the faith was established and confirmed. Accordingly, further religious laws and rulings were introduced in the Madinite period.