A vast range of present day Muslims have a longing of triumph, implementation and penetration of Islam. For striving to achieve this ideal they have two major notions. First is to inflict Islam and its teachings by force and power; while the second is to Islamize the society through preaching, arguing, reasoning and moral uplifting of the organs of society in the light of Islamic teachings. This paper discusses these thoughts in the light of Qur’an, Sunnah and Sirah of Prophet Muhammad (S.A.W). Its findings support the second notion, rejecting the first and demonstrating it against Islamic teachings. According to the investigation, basic principles of preaching and flourishing of Islam, qualities of a preacher, injunctions about preaching, jihad and socio-political efforts, on behalf of Qur’an, Sunnah and Sirah, prove that the right, legal and beneficial method for Islam and Muslims is of preaching and moral renovation of the society.