The early church fathers are clear in their testimony that the one God of the Christian faith is the person of the Father in particular, as can be seen here: I believe in one God, the Father Almighty. This is not to the denial of the divinity of the Son and Holy Spirit, but rather an acknowledgement of the Father alone being the supreme uncaused Cause of all, including the Son by eternal generation and Holy Spirit by eternal procession, as well as an acknowledgement of the Father being the Supreme Authority and Head over all, even over His only-begotten Son and Holy Spirit.
After the Nicene era, there is considerably less focus on this important biblical truth. After the Protestant Reformation, however, there seems to have been something of a recovery of this doctrine within Anglicanism. In this post, we see excerpts from Bishop John Pearson’s Exposition of the Creed, wherein he makes several references to the Father in particular being the one God.
Bishop John Pearson (1612-1686):
“That one God is Father of All; and to us there is but One God, the Father of All; and to us there is but one God, the Father.” (Pearson, On the Creed, Page 26)
“And thus to us there is but one God, the Father, of whom are all things; To which the Words following in the Creed may seem to have relation, The Father Almighty, Maker of Heaven and Earth.” (Pearson, On the Creed, Page 26)
“From hence He [the Father] is stiled One God, (1 Cor 8,6; Eph 4,6) the True God, (1 Th. 1,9) the Only True God, (Joh. 17,3;) the God and Father of our Lord Jesus Christ, (2 Cor. 1,3; Eph 1,3;)” (Pearson, On the Creed, Page 40)
“After the confession of a Deity, and assertion of the divine unity, the next consideration is concerning God’s paternity; for that one God is Father of all [Eph 4:6], and to us there is one God, the Father [1 Cor 8:6].” (Pearson, On the Creed, Page 45)
“I shall briefly declare the Creation of the World to have been performed by that One God, the Father of our Lord Jesus Christ.” (Pearson, On the Creed, Page 63)
“But as we have already proved that One God, the Father, to be the Maker of the world,” (Pearson, On the Creed, Page 64)