There is a lot of confusion for many regarding the distinctions/lack of distinctions between the divinities.

The first thing you must know is that there is only ONE Supreme Being/God in Kushite-Kemetic spirituality.

This one God is specifically called Nebertcher (meaning "Lord of All"). However, there are a number of names that are essentially the same as Nebertcher but in different activities as the Supreme Being.

Amen, Ra, and Ptah are the three principal names used to refer to the Supreme Being. They are not different entities, but the same entity in a different activity.

It is explained in the Meduneter that God in his supremacy as mystery (Amen), in his revelation through light (Ra) and his manifestation (Ptah), is the same One Supreme Being. In addition there is Atum, who represents completion.

Please read "The Husia" by Dr. Maulana Karenga which documents actual Kemetic texts on this; it will provide this insight.