Zoth-Ommog is an ancient deity that is the creator of reality and our world within it. It exists as one God, but shares three aspects. God is eternal and has always existed. However, his power is so great that he is prevented from entering our world directly. To get around this, it incarnates himself through seven mortal virgin brides on earth. These brides would die in labor, producing the seven incarnations of the god. The incarnations at some point would combine with each other and become one individual, who would conquer this world and bring it to the true faith. After his conquest is complete, he returns to the heavens to watch over humanity. The religion he leaves behind will worship these three representations of their deity. with one aspect as God the Father, the seven brides as one aspect of God the Mother, and the conqueror as God's representation on earth. Together, they are revered as a " blessed trinity " and are the CenterPoint of this religion.
The aspect of the Son is easy to justify. God divided himself into many pieces in order to enter our world, and ascended when his mission was complete. The aspect of the Mother is harder to justify. These brides were born and died as mortals, with all their human frailties and weaknesses. This aspect is represented as the mother of God, wife of God, and God itself. This is a conflicting narrative, and also contradicts the established notion that God has always been and will ever be, with no beginning or end.
How can I make this triadic nature of this god make sense as a cultural development? Are there any comparable examples?