How did Islam change and spread? How big is the Islam community? What are the 4 reasons why Islam spread so quickly?

Islam 

Belief in the Oneness of God: Muslims believe that God is the creator of all things and that God is all-powerful and all-knowing. God has no offspring, no race, no gender, no body, and is unaffected by the characteristics of human life.

It is the mode of spreading faith among the diverse people of the world. It is the only channel to spread knowledge and virtue around the universe.

How did Islam change and spread?

How big is the Islam community?

What are the 4 reasons why Islam spread so quickly?

Why study Islam?

What was the impact of Islam on our society?

How does Islam contribute to social development?