My answer to this is that the Father exists as a Spirit inhabiting eternity (Isaiah 57:15). He lived one eternal moment and then descended into time in order to take on human flesh;
Eph 3:11, According to the eternal purpose which he purposed in Christ Jesus our Lord:
The same Spirit exists in eternity as the one true God (John 17:3);
and in human flesh in the Person of the incarnation of the one true God (He is truly God).
There is one God; even the Father (1 Corinthians 8:6, Ephesians 4:6, James 3:9 (kjv));
Who has been incarnated in flesh in the Person of Jesus Christ.
Anything else is Tritheism.