I am most certainly NOT a Modalist. You insult me. Read the definition. Father, Son and Holy Spirit co-exist. They do not exist one-after-the other, as Modalists say.
You say "Isaiah 9:6 is "NOT" teaching that Jesus Christ is God the Father," yet we are told Jesus was the Word who created all things. Perhaps you need to clarify your very firm statement, it reads like a denial of Christ's divinity.
In John 1, Jesus is the Word/the Creator.
In the beginning was the Word, and the Word was with God, and the Word was God. The same was in the beginning with God. All things were made by him; and without him was not any thing made that was made. (Joh 1:1-3 KJV)
For unto us a child is born, unto us a son is given: and the government shall be upon his shoulder: and his name shall be called Wonderful, Counsellor, The mighty God, The everlasting Father, The Prince of Peace. (Isa 9:6 KJV)
As you admit, the Pharisees denied the divinity of Jesus, and your comment sounds similar. Perhaps you meant something else, because the consequences can be very serious. The cults, J.W.'s for example need to be aware of the seriousness of their false teaching. If I misunderstood you, then I apologise in advance.
"If God were your Father, ye would love me: for I proceeded forth and came from God; neither came I of myself, but he sent me. Why do ye not understand my speech? even because ye cannot hear my word. Ye are of your father the devil, and the lusts of your father ye will do. He was a murderer from the beginning, and abode not in the truth, because there is no truth in him. When he speaketh a lie, he speaketh of his own: for he is a liar, and the father of it." (Joh 8:42-44 KJV)