Answer 1
Islam was spread through trading and Muslim travels from one place to another. Non Muslims in other areas felt Islam truthfulness and its good morals and conducts. People converted, and still are converting to Islam, because:
Islam spread was not spread by war or by sword as some claim. Refer to question below for more information.
Answer 2
Islam was both a religion and a political entity. While the religion was not often spread by "Convert or Die" pronouncements (such as was the case in Christendom), Islam as a political entity was spread by armies and warfare. In general, the following reasons account for the spread of Islam both politically and religiously.
1) Arabia - What's that?: Prior to Mohammed, Arabia had been seen as a cultural and political backwater barely worth notice and therefore Mohammed's consolidation of the Arab Tribes was not seriously considered by the Byzantine and Sassanian Empires. This lead to a very porous southern defense and miscalculation of the Islamic Armies.
2) Byzantine-Sassanian Wars: Since the Byzantines and Sassanians considered each other the only real civilizations in the region, they fought each other numerous times in the early 600s C.E. over control of what is today East Turkey and Iraq. These were intense religious wars (Christian vs. Zoroastrian) and greatly weakened both empires at just the wrong time.
3) Tribal Command Structure: Arab Tribes and warriors owed their loyalty to their Sheikhs and leaders without fault because the Sheikh provided each person with all of the amenities and protection necessary to live a full life. Whenever the Arabs went to war, the Sheikhs could count on the ability to muster their tribesmen as soldiers without issue.
4) Support of the Locals: Since the Byzantine Empire and Sassanian Empire were engaged in religious zealotry, it stands to reason that they did not tolerate their religious minorities very well. The Muslims professed to (and did) treat minorities far better than either of these Empires. This led to religious minorities (especially Jews) from within the conquered territories helping Muslims to secure outposts and positions, freeing the Muslims to continue to spread the religion.
5) Citizenship by Conversion: The Islamic Empire was interesting in that being the leader or a person of import in the Empire was not contingent on ethnicity or place of birth as was the case of most prior empires. All a person had to do to gain power and prestige was to convert to Islam. This simple integration mechanism resulted in massive number of Persians, Berbers, and Turks converting to Islam. In fact, the furthest expansions of Islam (Spain, India, West China, South Russia, the Balkans) were all accomplished by non-Arabs (respectively Berbers, Persians/Mughals, Turkmen, Azeris, and Ottomans).
6) Warfare: The leaders charged with expanding the influence of Islam were thoughtful and diligent military leaders. Caliph 'Omar, who conquered much of the Levant, Egypt, Persia, and Iraq was well-known as a strategist and a fighter. It was this knowledge of warfare that allowed Muslim forces to expand the territory's influence.
7) Universality: Islam, as a religion, claims salvation for all people in all places, making the religion very attractive, especially to people born into low castes and bad economic positions.
8) Commerce: Islam, like most religions, spread also through peaceful means of commerce and education whereby non-Muslims learned of the faith and adopted as their own amidst business dealings with Muslims.
The Muslims continued preaching Islam during the Rightful Caliphate (Hazrat Abu Bakr RAU, Hazrat Umar RAU, Hazrat Usman Ghani RAU, Hazrat Ali RAU.) They had to face and fight against the forces opposing Islam, but they fought dauntlessly and defeated all these forces. The Muslim traders also played great role in the expansion of Islam. The simple and based on human nature teachings of Islam appealed to the hearts of people and they accepted Islam.
By preaching and contributions of his followers .
After 850 C.E. Islam primarily spread by conquests on one hand and peaceful evangelism through trade on the other.
All over the world. It is a universal religion.
By their invensions
because they died \
After the death of Muhammad, Islam spread all the way to the northern Arabian Peninsula.
H. Abu Bakar sidique Ra the first caliph was leader of Muslims after death of Prophet Muhammad SAW.
Khawaja Muhammad Islam has written: 'The spectacle of death including Glimpses of life beyond the grave'
The leader of Islam after prophet Muhammad (PBUH) death was titled ' Khalifa' in Arabic or Caliph in English. This means the successor. The plural in Arabic is 'Kholafaa' or Caliphs in English.
Caliphs
Muhammad was the founder of Islam and the proclaimer of the QurΚΎΔn, Islam's sacred scripture.
http://www.religionfacts.com/islam/history/prophet.htm last paragraph.
No, because Islam was founded after the death of Christ.
Islam is the religion based on the teaching of Muhammad.
None Allah (God in English) is the founder of Islam before prophet Muhammad (PBUH) and after him. Refer to related question below.
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