To the true Christian.. why did God had to kill his only son in order to forgive our sins... why didn't he just forgive us without that killing?

As above no trolling pls
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We are talking about the all mighty who doesn't need to explain or justify.. he says be and it will
To the true Christian.. why did God had to kill his only son in order to forgive our sins... why didn't he just forgive us without that killing?
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