Jesus was put to death because his father did not step up to fill the ransom he himself set of a barbaric blood sacrifice.
His father should have stepped up therefor Jesus died for his father's sin of demanding his death and allowing the justice he is supposed to represent accept a bribe.
It is another unsupported premise that "he (god) himself set of a barbaric blood sacrifice". The Abrahamic god, by definition, cannot die, so it is nonsensical say he should have "stepped up". Jesus was incarnated as a man expressly for the purpose he purportedly served. So if there was to be no sacrifice, there would have been no Jesus, and you would have no excuse to make this argument.
Death is a natural consequence of "sin", not an arbitrarily punishment assigned by god.