Some people think that the substitutionary atonement doctrine is immoral because it amounts to child abuse (the Father sent the Son to die for us) and that it makes the innocent suffer for the guilty (Jesus was without sin and suffered for us).

As far as the criticism that the innocent has suffered for the guilty, there is a factor which this criticism overlooks. It is that God is the one who is offended, and He has the right to forgive. Since Jesus is God in flesh, He is the one who is resolving the sin problem which is against Himself.  In other words, the one offended is also the one atoning. The criticism, on the other hand, excludes this point.