“9. If then the Father be called the only true God, this is said not to the denial of Him who said, ‘I am the Truth John 14:6,’ but of those on the other hand who by nature are not true, as the Father and His Word are. And hence the Lord Himself added at once, ‘And Jesus Christ whom You sent. ’ Now had He been a creature, He would not have added this, and ranked Himself with His Creator (for what fellowship is there between the True and the not true?); but as it is, by adding Himself to the Father, He has shown that He is of the Father’s nature; [HUGE!!!!! THAT IS JUST HOW THE NICENE CREED 325 READS! GENRIC UNITY! WOW!!!-DS] and He has given us to know that of the True Father He is True Offspring. And John too, as he had learned , so he teaches this, writing in his Epistle, ‘And we are in the True, even in His Son Jesus Christ; This is the True God and eternal life 1 John 5:20.’”
“19… For only in this way can we anyhow become imitators, and in no other, when we minister to others what comes from Him. And as we put a fair and right sense upon these texts, such again is the sense of the lection in John. For he does not say, that, as the Son is in the Father, such we must become:— whence could it be? When He is God’s Word and Wisdom, and we were fashioned out of the earth, and He is by nature and essence Word and true God (for thus speaks John, ‘We know that the Son of God has come, and He has given us an understanding to know Him that is true, and we are in Him that is true, even in His Son Jesus Christ; this is the true God and eternal life 1 John 5:20 ’) and we are made sons through Him by adoption and grace, as partaking of His Spirit (for ‘as many as received Him,’ he says, ‘to them gave He power to become children of God, even to them that believe in His Name John 1:12 ’), and therefore also He is the Truth (saying, ‘I am the Truth,’ and in His address to His Father, He said, ‘Sanctify them through Your Truth, Your Word is Truth ’); but we by imitation become virtuous and sons:— therefore not that we might become such as He, did He say ‘that they may be one as We are;’ but that as He, being the Word, is in His own Father, so that we too, taking an examplar and looking at Him, might become one towards each other in concord and oneness of spirit, nor be at variance as the Corinthians, but mind the same thing, as those five thousand in the Acts Acts 4:4, 32, who were as one.”
Athanasius is saying that the word Theos/God here is to mean divine, with regard to nature, not The One God, with regard to person when speaking of the Son of God.