Question

Why was the Ka'bah built and how was it used at the time of Muhammad's birth?

Answer 1

The Ka'bah was built to worship a single God, which is called monotheism, but people used it to worship multiple traditional gods, which is called polytheism, by leaving their religious possessions there for safety.

Answer 2

The Ka'bah was built to worship a single God, which is called monotheism.

The people used it to worship multiple traditional gods, which is called polytheism, by leaving their religious possessions there for protected keeping.