Final answer:
The pre-Islamic people called the one supreme High God Allah. Allah was the chief god of the Meccan pantheon and was worshiped in various regions. He became the God of Muhammad's Islamic religion.
Step-by-step explanation:
The pre-Islamic people referred to the one supreme High God as Allah. 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, but Allah was the only god without an idol. Allah later became the God of Muhammad's new Islamic religion.