The second most widely practiced religion is Islam, with an estimated 1.8 billion followers worldwide. It started in Mecca (a city in modern-day Saudi Arabia) in the 7th century CE and was spread by the Prophet Muhammad (570–632 CE), who followers of Islam believe to be God’s ultimate prophet.
Who is the leader of the Protestant Church?
Martin Luther, often called the father of Protestantism, fundamentally changed the Christian world through his force of will and new ideas. He tried passionately to reform the Catholic Church.