There is one God.

But that one God has got a head.

He has got his liver. He has got his stomach.

He has got his nose. He has got everything just like human beings have because

God made human beings in His own image.

He has different parts in the bodies and He has to run those different parts.

For these different parts, He has to have Deities and these Deities are to be understood.

Unless and until you understand and worship those Deities, you cannot awaken those Deities within yourself.

They all are part and parcel of the Adi Shakti.