ATG is not arguing here about what we must do to be saved.
You missed the part about Jesus dying for us to repent of our sins, and not being guilty of His shed blood on the cross.
Moat unrepented sinful Christians are blind to the preaching of repentance unto salvation. Willingly.
Mat 6:23
But if thine eye be evil, thy whole body shall be full of darkness. If therefore the light that is in thee be darkness, how great is that darkness!
He is questioning whether God did exactly what the theory of Penal Substitutionary Atonement (PSA)
Mat 15:9
But in vain they do worship me, teaching for doctrines the traditions of men.
One thing I know for sure, is that my salvation and walk with Jesus Christ, is not by some lame PSA of men.
demands that He had to do to effect salvation; and whether the demands of PSA might in fact impugn God's character.
If PSA is having to impute Jesus Christ with sin, and make Him guilty and worthy of death by law, then it's the same old character assassination against God the Son and the Father, that His false accusers and wicked crucifiers made against Him long ago...
I mean seriously, who trusts their immortal soul on a PSA pill? sounds like some sort of venerial disease.
The gospel of Jesus Christ for repentance unto salvation from sinning: The innocent Lamb of God willingly died by the hands of wicked sinners, so that all sinners should repent of their own wickedness.
Rom 7:13
Was then that which is good made death unto me? God forbid. But sin, that it might appear sin, working death in me by that which is good; that sin by the commandment might become exceeding sinful.
That's the gospel that preaches righteous truth, not some sinner's own PSA disease...