Upvote:2
Certainly if the Jews thought that Jesus was merely claiming to be the Messiah, this argument would be valid. Because that is Jesus' argument: if He is the Messiah, calling Himself such is not blasphemous.
Tuggy then invalidly extends this to mean that Jesus is only the Messiah, not God. But when the Jews accuse Jesus of claiming to be God, Jesus answers a different objection: that He called Himself the Son of God. The Jews were left without a reason to stone Him (as the passage says, they tried to arrest Him after that) but were still angry.
Tuggy claims that when Jesus says, "The Father and I are one," Jesus was merely referring to unity of purpose. But that's clearly not the Jews' understanding - as he notes! He writes:
Often [readers] seize on the Jews’ reaction, “you… are making yourself God” [...] They don’t notice that Jesus corrects them about what he’s claiming!
Because He doesn't. The Jews said, "You're blaspheming by claiming to be God!" Jesus doesn't say, "I'm not claiming to be God" but rather, "I'm not blaspheming."