Unfortunately, the KJV is not without some faults, an example following, the lined through is what does Not exist in this verse.
Eph 3:9 - and to make all see what is the fellowship of the mystery, which from the beginning of the ages has been hidden in God who created all things through Jesus Christ;
"created all things" = Father -> Isa 44:24 - Thus saith Yehowah, thy redeemer, and he that formed thee from the womb, I Yehowah that maketh all things; that stretcheth forth the heavens alone; that spreadeth abroad the earth by myself;
Who is He -> Hear, Israel: Yehowah our God is ONE Yehowah = Father John 17:3.
What does your mate Paul say in this regard;
1 Cor 8:6 - yet for us there is one God, the Father, of whom are all things, and we for Him; and one Lord Jesus Christ, through whom are all things, and through whom we live.
What do the Greeks tell us the context of "through" is;
dia: through, on account of, because of
Original Word: διά
Part of Speech: Preposition
Transliteration: dia
Phonetic Spelling: (dee-ah')
Definition: through, on account of, because of
Usage: (a) gen: through, throughout, by the instrumentality of, (b) acc: through, on account of, by reason of, for the sake of, because of.
The highlight, is the reasons why the Father alone and by himself created, for the future one to be born from Mary, to which he would then inherit all things from the Father 
