Though HE is ONE, there are multiple members that exist in the ONE, with different functions: there is the FATHER (The HEAD or GOD HEAD) , HE is greater than All, and everything comes from HIM. Followed by the SON (The MESSIAH), There is the HOLY SPIRIT, there are Angels, etc.
The CREATOR is ONE, can exist in multiple unlimited places at thesame time. HE is everywhere, and a SPIRIT. HIS SPIRIT is in HIS Holy Creations. HE is in the SON and the SON is in HIM. HE is the SON and the SON is HIM.
We live in HIM.