But there is no question that the continual emphasis on "God" sacrificing "his Son" really isn't helpful and can be confusing. On forums where atheists congregate, "God the child abuser" is a favorite target. For that matter, penal substitution is only one model of the Atonement (and Jesus himself referred to it as a ransom). "God sacrificed himself for humanity" is surely a better model than "the Father sacrificed his own Son to satisfy his wrath." As I recently mentioned on another thread, William Lane Craig teaches that the Father-Son-Spirit is just the "economic" Trinity, God's way of revealing himself to humans for purposes of the Incarnation and Atonement. In the real "ontological" Trinity, there is just the Godhead without Father-Son distinction. In any event, viewing the Crucifixion as God sacrificing his own Son, as though this were Fred sacrificing little Freddie, is quite misleading IMO.
"viewing the Crucifixion as God sacrificing his own Son, as though this were Fred sacrificing little Freddie, is quite misleading"
You're durn tootin it's misleading, and that's why atheists love that misleading analogy. Here's the diff:
1. pagan children aren't volunteering to die, but Jesus laid His own life down (volunteered).
2. child sacrifice is completely worthless, even though those people believed it appeased the wrath of their gods. But Jesus' sacrifice (travail) actually appeases God's wrath, according to Isa. 53 and the NT explanation that He saved us from God's wrath.
3. pagan sacrifices don't cause anyone to be righteous in the sight of God, but Jesus' sacrifice does, for everyone who believes in Him.
Nevertheless, the Father sacrificing His Son is the only valid basis for redemption (the ransom of the souls of believers). It is written in every book of the Bible, such as: John 3:16 that says God gave His Son, in the context of "as Moses lifted up the serpent in the wilderness, so must the Son of Man be lifted up, that whoever believes may have eternal life" - this 'lifted up' is the crucifixion. He MUST be lifted up, meaning it's the only action that turns a person's faith in Christ into full atonement with God. In Mat. 26:39 Jesus pleaded with the Father that there be another way, but submitted to the Father's will (to die on the cross). In Heb. 9:14 and elsewhere, Jesus' sacrifice is the only avenue to a pure conscience. Therefore, penal substitutionary sacrifice cannot be avoided in the teaching of the gospel. It's the basis for justification by faith.
A misleading analogy that atheists argue doesn't justify an avoidance of critical gospel teaching. People reject Jesus, God, and the gospel not because it doesn't make sense, but because they hate God and His morality, and they are unwilling to submit to His sovereignty. 1 Cor. 1.