The Jewish Bible disagrees about the virgin, and this is one instant where even the Protestants accept the Septuagint version of the OT in order to "fit" the prophet with Christ.
These are all, what A-G would call, doctrines and interpretations of men. We first believe and then go through mental gymanstics to attempt to prove that what we already believe is true.
Even that one passage where the name shall be Emanuel is not the same as Yeshua.
There is nothing in Isaiah that is obvious except to someone whose mind has already bene made up. That provies nothing about Isaiah.
As for Zacheriah, he lived under Babylonian captivity, which you fail to mention. This is at least a hundred if not more years after Isaiah.
The "messianic" message of Isaiah and Zacheriah only relfect a desire for an emerging Jewish king to defeat the enemies (in Isaiah's case — of the land of Judah). Such a person is idealized. But that doesn't mean it is foretelling of Jesus Christ.
God's truth does not depend on human rendition of history or prophesy, etc. Our limited language prohibits the descirption of the unlimited, our finite minds fall short of conceiving the infinite.
We need to find God's message, not magic in the Bible. For we know what love is but we cannot describe it. To us it's real. But one must experience it to know it. And no book or picture will fully capture it.
We read the Bible to find God's truth in it, but we already must know the truth to find it. And it's behind the historical tales, and myths, parables and events. It's not the myths and the tales and parables and the events; it's behind them.
No one reads the bible in order to believe; rather we read the bible because we believe.
“No one reads the bible in order to believe; rather we read the bible because we believe.”
It works both ways, John says, “these things are written that you might believe...” If you don’t read the bible you have a credulous faith, actually not faith but superstition, grounded on nothing. His word is the only place God’s Son and His grace is revealed.
Psa 138:2 I will worship toward thy holy temple, and praise thy name for thy lovingkindness and for thy truth: for thou hast magnified thy word above all thy name.
But you still haven’t addressed the two servants in Isaiah 42; one being Messiah and the other Jacob (Israel).
This simply is not fact.
Many scholars dispute it. Therefore, to say "scholars have shown" should really be "some scholars believe."
They don't? What advice do you give people who are struggling to believe?
I tell them to find a Bible and read it.