One cannot use Isaiah and Hosea scriptures out of its context to support the notion that there is no savior other than God? Why?
Because the Scriptures mention some humans called "saviors" other than Jehovah and Christ. The same hebrew word for all three. Check it out.
And as to Christ being "Savior," the Bible makes it clear that it was God who made him so. What it does prove is that the Supreme Savior is Jehovah.
Any other serving in the capacity of "savior" is due to God allowing it for a special purpose.
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Acts 5:31: “God exalted him [Christ]at his right hand as Leader and Savior that he might give repentance to Israel.” (NRSV)
And as for John 1:1 being "definitive" because of the Word being called "God," one needs to look at the context,
where it describes the Word being "with" God, so, the Word "God" is not exactly the God he was with.
It is used as an adjective, i.e. as "divine," "a divine being." John clears up any potential confusion by saying,
that Jesus is the Christ, the Son of God, not "God" (20:31)