How did the Qur’an challenge polytheistic beliefs in pre-Islamic Arabia?

The Qur’an challenged the polytheistic beliefs of pre-Islamic Arabia through an uncompromising doctrine of monotheism, known as tawhid (the assertion of oneness). This message directly countered the prevailing pagan religious system in several key ways:12

• Rejection of Intermediaries: While pre-Islamic Arabs often viewed their deities as subordinate intercessors who could bridge the gap between humans and the divine, the Qur’an asserted that God is one, unique, and has no partners or equals. It maintained that there are no intermediaries between God and his creation.13
• Elimination of Idolatry: The Qur’an explicitly rejected all forms of idolatry and called for the removal of the various gods and divinities worshipped in sanctuaries, most notably those housed within the Ka'bah in Mecca.1
• Replacement of Fate: The Qur’an replaced the pre-Islamic belief in a blind, inexorable fate—over which humans had no control—with the concept of a powerful, provident, and merciful God who actively guides humanity along the "straight path".1
• Condemnation of Associationism: The Qur’an labeled the practice of worshipping multiple gods as "associationism," charging opponents with the sin of illicitly relying on other beings alongside God.3