Why did God had to kill his son (Jesus) in order to forgive our sins? Why didn't he just forgive without such killing?

Why did God had to kill his son (Jesus) in order to forgive our sins why didn't he just forgive without such killing?
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The problem is... does God by killing his only don condom and encourage killing?
Why did God had to kill his son (Jesus) in order to forgive our sins? Why didn't he just forgive without such killing?
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