Richie,
Mighty God is an expression solely reserved for the only true God, the Supreme Being. When you study the original language, it is exactly as indicated where this title "Mighty God' belongs to Almighty God!
Your statement is quite pompous, ending as it does with an exclamation point. If you really are a student of the original language, as you seem to suggest by your statement, you know very well that "almighty" and "mighty" are not related words in the Hebrew language, even though they appear to be in English. The word "mighty" has to do with strength, power, and ability to prevail. The word normally translated as "almighty," which comes from a different Hebrew word, shadday, has to do with self-sufficiency or the "all-providing" character of God. It may also have reference to his "invincible" nature. Hebrew scholars are not in total agreement with the exact meaning of this word.
The Brown, Driver and Briggs Hebrew and English Lexicon of the Old Testament defines "Mighty God" as "divine hero, reflecting the divine majesty." It is precisely that same Messianic sense which allows the psalmist to address the king of Israel as "God," without inviting us to think that there are now two members of the Judeo-Christian God. The quotation of Psalm 45:6 in Hebrews 1:8 brings that same Messianic use of the word "God" into the New Testament. We should not misunderstand this very Jewish use of titles. It is a serious mistake to think that the Messiah has now stepped into the space reserved for the One God, the Father. However exalted the position of Jesus and despite his function as God's special representative, the strict unipersonal monotheism of Israel's faith is never compromised by any New Testament writer.
Regarding the Messiah's title "Mighty God," the NIV Study Bible footnote states: "His divine power as a warrior is stressed." There is no hint of the title belonging only to Almighty God, as you assume.
If you examine Isaiah 9 and 10 closely, you will note a distinction between Almighty God and Mighty God. They are not necessarily the same persons. Isaiah 9 concerns the origin of the Messiah. He starts as a child and goes through stages of development. He is not born as a government administrator: "The government will be on his shoulder." He is not born "Wonderful Counselor, Mighty God, Everlasting Father, Prince of Peace." Those are titles "he will be called." (Verse 6) He will be a man. "He will reign on David's throne and over his kingdom." Will he accomplish all this by his own power and authority? The answer is: "The zeal of the LORD Almighty will accomplish this." (Verse 7)
There are two ways of looking at the term "Mighty God" in Isaiah 10. (1) The fulfillment of verses 20-23 occurs long before the Messiah is born. At that time, the title is borne by God the Father. (2) According to Jewish understanding, Isaiah 9:6 had a fulfillment in King Hezekiah. Isaiah 10:21 also has its fulfillment in him. Isaiah 10 speaks of both "the LORD God Almighty" and "the mighty God" within a few verses of each other. See verses 21, 23 and 24. In the fulfillment, a faithful remnant led by Hezekiah survived the Assyrian invasion of 701 B.C., and later a remnant returned from Babylonian exile. Any return to the Almighty at that time required a return to Hezekiah, God's appointed leader of the people. That is a perfectly logical explanation of Isaiah 10:20, 21: "In that day the remnant of Israel, the survivors of the house of Jacob, will no longer rely on him who struck them down but will truly rely on the LORD, the Holy One of Israel. A remnant will return, a remnant of Jacob will return to the Mighty God [Hezekiah]."
If you can't acknowledge that men like Moses, David, and Hezekiah were rightly viewed as "God" by the Jews, your disagreement is with Almighty God and with the men he inspired to write the Old Testament.
herk