One of the major criticisms of Christianity (and in particular Protestant Christianity) is that virtually anybody can become forgiven simply by professing faith in Jesus Christ and expressing repentance even a serial killer or a murderous tyrant while a pious non-Christian will not.
However in secular humanist morality is forgiveness possible for certain classes of individuals and if so how can it be achieved? While most people here will presumably agree that a thief or a similarly petty miscreant can be forgiven after a genuine expression of regret and an attempt at restitution, what about worse classes of people? If a serial killer or a child rapist or a war criminal was genuinely remorseful for his actions, what should he do to atone for it according to secular humanist morality? Can he do so simply by words and deeds without being condemned as a hypocrite?