1 Corinthians 3:2
I gave you milk, not solid food, for you were not yet ready for it. Indeed, you are still not ready.
When talking to a child you might explain ‘good’ and ‘bad’ more in terms of reward and punishment. This is a valid option, given the audience you’re talking to.
However we should approach ideas about God as adults and know from the start that God is perfect. He does not need for anthing.
Any talk then about him needing Satisfaction then must be seen in the light that it’s not the fullest expression of truth available.
Unfortunately, the Catholic Church uses language that peaks at the lower level of expression. The RCC talks about rewards and punishments
We need not dwell upon the possibility of the salvation of mankind or upon
its appropriateness. Nor need we remind the reader that after God had
freely determined to save the human race, He might have done so by
pardoning man’s sins without having recourse to the Incarnation of the
Second Person of the Most Holy Trinity. Still, the Incarnation of the Word
was the most fitting means for the salvation of man, and was even
necessary, in case God claimed full satisfaction for the injury done to him
by sin (see INCARNATION).
How was God (who is perfect) injured?
In the catechism…
1494 The confessor proposes the performance of certain acts of
"satisfaction" or “penance” to be performed by the penitent in order to repair the harm caused by sin and to re-establish habits befitting a disciple of Christ.
This is a better explanation. Except it doesn’t express to whom the harm is done… which must be to us.
However elsewhere it goes to talk about God needing to be satisfied
616 It is love “to the end” that confers on Christ’s sacrifice its value as
redemption and reparation, as atonement and satisfaction. He knew and loved
us all when he offered his life. Now “the love of Christ controls us,
because we are convinced that one has died for all; therefore all have
died.” No man, not even the holiest, was ever able to take on himself the
sins of all men and offer himself as a sacrifice for all. The existence in
Christ of the divine person of the Son, who at once surpasses and embraces
all human persons, and constitutes himself as the Head of all mankind,
makes possible his redemptive sacrifice for all.
Protestants also have a God that needs…
See for instance John Calvin’s Teaching on the Vicarious Sin-bearing of Christ by Dr. Brian Allison
Wherein he quotes Calvin…
"His fundamental assumption was that man by sinning offended the honour of God. Now God could either punish man or demand satisfaction of him. Since the former alternative would have involved the destruction of man, His handiwork, He chose the latter, in order that man might be saved. The satisfaction required was an infinite satisfaction, such as no mere man could render; and therefore it became necessary for the Son of God to become man, in order to satisfy the divine honour"
Vicarious Atonement, 22f