To keep it short I will comment on only one verse that you quoted which is...
Isaiah 9:6
“a child will be born.” The Hebrew text reads “a child has been born... a son has been given.” The Hebrew verb about being born is a perfect passive and is most literally translated “has been born.” Although some scholars say this prophecy is about Hezekiah, and in fact it may reflect upon him in part, the prophecy is more completely about the Messiah. It's common in the Hebrew idiom to write about something that will happen in the future as if it had happened in the past, and this is referred to by many scholars as the idiom of the “prophetic perfect.” Also, the prophetic perfect occurs very often in prophecy, especially in Isaiah.
“The Mighty God is an Extraordinary Advisor” The phrase is usually translated as “Mighty God, Wonderful Counselor” in most English Bibles. However, a better way to understand it is as a theophoric name given to the Messiah which describes God, not the Messiah. It's noteworthy that if Isaiah 9:6 was a proof that Jesus is God, nothing is said about it in the New Testament.
“Mighty God/Warrior God” el gibbor is the same name attributed to Yahweh (the true God) subsequently in Isaiah 10:21, as well as in all the other biblical occurrences Deuteronomy 10:17; Jeremiah 32:18). So, in the other places where this same phrase is used in the singular, it's referring to Yahweh, not to anyone else. So, in every occurrence of el gibbor, it refers to God the Father—Yahweh. This provides strong evidence that el gibbor in Isaiah 9:6 likely also refers to Yahweh.
Although some Trinitarians attempt to see this text as teaching the Messiah’s Deity, many do not consider that the text taken consistently in their framework would actually be calling the child “The Everlasting Father.” That would then make Jesus the “Everlasting Father” which would be Modalism, where God is strictly a unitary being who exists at different times in different modes (i.e., the Holy Spirit, the Father, and the Son). The Athanasian Creed, which is considered as orthodox today states that Christians should “neither confound the Persons nor divide the Substance” but if Isaiah 9:6 says the Son is the Father, then it would be doing that and not teaching the modern definition of the Trinity.