Do you believe the Son is the Father according to Isaiah 9:6?
Isa. 9:6 doesn't say that "the Son is the Father".
It's not referring to God the Father.
"Father" in this context means "Creator":
Isa. 64:8 But now, O LORD, You are our Father,
We are the clay, and You our potter;
And all of us are the work of Your hand.
Mal. 2:10 Have we not all one Father?
Has not one God created us?
Why then are we faithless to one another,
profaning the covenant of our fathers?