Final answer:
Islam is the dominant religion in the Middle East today with approximately 1.5 billion followers worldwide.
Step-by-step explanation:
The Middle East is a region known for its religious diversity, with several major world religions having historical and cultural roots in the area.
The dominant religion in the Middle East today is Islam. Islam originated in the Middle East and spread between 300 and 1500 CE. By 1200, Muslim rulers dominated the Middle East, North Africa, Persia, and South Asia. Today, Islam is the second largest religion in the world, with approximately 1.5 billion followers.