Who then is this God and Father who is above all?

  Ephesians4:6 NASB "one God and Father of all who is over all and through all and in all."

One of the main reasons nontrintarian Christians feel compelled to reject the doctrine of the holy trinity is that it involves the same oft repeated seductions to a free lunch common to all poorly conceived philosophies.To give an example if the trinity doctrine as commonly explained by mainstream churches is true then manifestly no member of the trinity can be "over all" since not only would there be at least two others who are equal in divinity but there would be one (i.e the totality of the Godhead) who/which? would be greater than any single member.The trinity itself/himself? would alone be over all,The God,The most high,the only true God etc.

 Yet the scriptures repeatedly speak of the father alone as the most high,Ho theos i.e the God,the only true God,and as being over all including Christ.

The other purported members of the trinity are spoken of as being of God i.e subject to God so that Jesus is Son of The God(not merely the father) and never God the son,The spirit is the spirit of God(not merely the father or the son) and never as God the spirit. The Father by contrast is always the God the father and never the Father of the God clearly then the Father is the God who owns, sustains and controls the son and the spirit. The father's name alone in scripture is ever referred to as the sacred/holy name hence our lord prayed that YOUR (second person singular possessive),not our name be hallowed/sanctified.

 According to the words of our Lord and saviour Jesus the messiah the time is at hand for all seeking the approval of the one true God to reject this particular seduction to a free lunch and turn to the father i.e Jehovah/yahweh God as the one true God.

John4:23NASB "“But an hour is coming, and now is, when the true worshipers will worship the FATHER in spirit and truth; for such people the Father seeks to be His worshipers"