Why did the leaders of Mecca want to keep polytheism

Because it was the religion of there forefathers.

Explanation:

Located in the mountains of western Saudi Arabia, the city of Mecca (also spelled Makkah) began as an early trade center for the region and a hub for camel caravans trading throughout Southwest Asia and North Africa. Mecca is about forty-five miles from the Red Sea coast at an elevation of 531 feet. South of Mecca, the mountains reach more than 7,200 feet in elevation. According to Islamic tradition, the patriarch Abraham came to Mecca with his Egyptian wife Hagar and their son Ishmael more than two thousand years before the birth of the Prophet Muhammad (born 571 CE). When Hagar died, Abraham and Ishmael built the Kaaba (or Ka'ba), a rectangular shrine that included a special stone, in Mecca. The shrine was destined to become one of the holiest sites for nomadic groups in Arabia. Abraham later died in Palestine in what is now the country of Israel. Centuries after Abraham's death, the Kaaba and the rituals associated with it deteriorated and mixed with other local traditions.

The Prophet Muhammad

The traditional groups in the region of Arabia were polytheistic and worshiped their own gods. By the time of Muhammad, Mecca is said to have been a center of worship to more than 360 deities or gods; the greatest of these was Allah (meaning "the god"). Allah was known as the chief of the Meccan pantheon of gods and was worshiped from southern Syria to Arabia. Mecca was full of idols, temples, and worship sites. Tradition states that the god Allah was the only god without an idol; he would become the sole entity of Muhammad's new Islamic religion.

Muhammad, born in Mecca 571 years after the birth of Christ and about 100 years after the fall of the Roman Empire, was orphaned at an early age, and was employed in a camel caravan when he reached his teens. His life and what has been reported about it changed the Middle East forever. Muhammad traveled throughout the region with the camel caravans. He was fortunate to have been able to live as he did, because most orphans in the region did not have many opportunities in life. His travels introduced him to many people, places, and issues. His situation changed when Muhammad and a widow many years his senior were married. Muhammad became a merchant, the leader of a camel caravan, and a respected member of his community. He was reported to have been intelligent and a wise businessman.

The traditional groups that traded in Mecca held many different religious beliefs. The city was a forum for the many vices and activities associated with trade, travel, and metropolitan business. To escape the activities of Mecca, Muhammad would often seek the solitude of the mountains, where he would contemplate and think. Tradition states that the angel Gabriel appeared to him while he was meditating in a mountain cave in 610 CE, when Muhammad was about forty. Muhammad was given words from Allah, which he recited from memory to his followers. According to tradition, Muhammad was illiterate; his supporters wrote down his words, compiled them into the Koran (Qur'an), the holiest book of Islam. Muhammad was the founder of the new religion, which he called Islam (meaning "submission to Allah"). The term Muslim (meaning "one who submits") refers to a follower of Islam.

After Muhammad returned to Mecca and related his visions and Allah's words from the angel Gabriel, he began to speak out against the city's vices and many gods. He stated that there was only one god: Allah, the same creator god of Abraham. He spoke out against gambling and drinking alcohol. He advocated the caretaking of widows and orphans. He also preached regarding family and community. His message was not well received: in 622 CE the people of Mecca forced Muhammad out. He fled to the safety of the nearby city of Medina in a journey known as the hejira (hijra). This historic journey became the start of the Islamic calendar, which is based on the lunar cycles. Muhammad found refuge in Medina and became a respected citizen.

Launching out from Medina, Muhammad and those loyal to him defeated the army of Mecca and converted the city into Islam's holiest place. They destroyed all Mecca's idols and temples except the Kaaba. Muhammad's teaching united the many Arabian groups under one religion. Since the Koran was written in Arabic, Arabic became the official language of Islam. The Kaaba and the mosque built at Mecca became the center of the Islamic world and a destination for Muslim pilgrims. Islam brought a new identity, a faith in one god, and a set of values to the Arab world. Islam made sense in a world with many traditional beliefs and few unifying principles.

Answer: It taught people to obey them. It kept peace among the tribes. It let them sell idols.