You are missing the fact that it is the FATHER that is GREATER than Christ and not GOD that is GREATER THAN CHRIST.
Who [Jesus], being inherently in the form of God, deems it not pillaging [taking by force or plundering] to be EQUAL WITH GOD" (Phil. 2:6).
"I am going to the Father, for THE FATHER IS GREATER THAN I" (John 14:28).
Pay attention to the words and maybe you will see it. If the Lord wills.
Here are reasons why the Father is greater than Christ;
The Father is greater than Christ, but Christ is equal with God.
The Father never had a beginning. Christ has a beginning.
The Father was never given anything. Christ was given everything.
The Father will never bow down to Christ. Christ will one day bow down to The Father.
The Father was never created. Christ was, making Him the beginning of the creation.
The only reason Christ is equal with God is because the Father has lifted Him to this position through the things He suffered, endured etc.. but without the Father Christ would not have the power He does, and since The Father is also God, than Christ is equal with the Father only to this extent. Otherwise the Father is still greater for reasons i mentioned above.
I hope this helps your understanding.
Love in Christ,
Alex