Does Isaiah rule out human exaltation?

Isaiah declares the Lord uniquely sovereign and the Savior of Israel. I should take that seriously, then ask whether exaltation means replacing the Lord or receiving life and glory through Him.

You preserve Isaiah’s strong claim and identify the interpretive question without pretending the verse directly teaches LDS exaltation.

Isaiah is only talking about idols, so it has nothing to do with exaltation.

The polemic includes idols, but Isaiah also makes a positive claim about the Lord’s uniqueness and saving power. Address that claim directly.

Yes, exalted people become another member of the Godhead.

That conflates two teachings. The Church’s account of becoming like God does not say exalted people join the Godhead.

The Godhead is the Father, Son, and Holy Ghost. Exaltation describes what God gives his children through Christ.

You distinguish the identity and work of the Godhead from the destiny Latter-day Saint theology teaches for God’s children.

Second Peter speaks of becoming “partakers of the divine nature,” and Doctrine and Covenants 76 describes heirs who receive glory through Christ. Those passages can illuminate LDS belief, while Isaiah still uniquely identifies the Lord as Israel’s Savior.

You bring relevant texts into the discussion and retain the distinction between participation through Christ and Isaiah’s claim about the Lord.

Those verses prove Isaiah was teaching the LDS doctrine of exaltation.

They are relevant to a broader scriptural discussion, but they do not prove Isaiah intended or directly taught the LDS doctrine.

There are points of contact, but the traditions differ on God, humanity, and what deification means. I should describe each account on its own terms and not claim Isaiah settles the whole debate.

Correct. Similar vocabulary does not erase significant theological differences, and this passage alone does not resolve them.

Yes. They teach exactly the same thing, just with different words.

That overstates the agreement. Compare the traditions’ underlying claims about God and human nature before drawing a conclusion.