One substance of humanity divided among billions subsisting in human nature, and thus many individual substances and human beings. Whereas Supremely being itself Most wise God is infinitely self communicated among many divine persons. As when we say God is Trine ,it follows there are three hypostases of the Godhead.You are avoiding the simple Yes/No questions...
Are you and I one substance?
Are you and I one being?
I ask because you seem to equate substance and being.
When some say God is at once the Father Son Holy Spirit ,of itself and by itself signifies a Trine distinction in supposita to whom it is spoken The Holy Scriptures OT and NT are quite elucidating on what belongs to the unity of essence ,but it is only by divine revelations in mystery that He makes the distinction of persons and the equality of their majesty known. I don't know why it is hard for many of you to truly grasp that i"
"In God essence is the same as the suppositum (hypostasis) for what God is and whereby He is are the same". I don't know why it has not occurred to you that every divine person by Himself subsist numerically ONE with the divine nature. It follows to posses Godhead is to be God .
All of your suppositions start from three persons is three gods no matter what answer you get . You can never refute one word I suppose ,but because you import three beings as your starting point in engagement you further fail to grasp :
"But nothing that exist in God can have any relation to that wherein it exist or to whom it is spoken except the relation of identity and this is by reason of God supreme simplicity . God is spirit.
Hope that helps....Alan