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.