Why did the Son of God pay the exorbitant cost of our salvation?
The theory that the Son of God took the bullet meant for us besmirches the reputation of God the father. It can't be valid. God the Father is not a monster. He did not shoot his Son. He loves his son.
At Bethlehem, God delivered to us a love note. Imagine that. A love note from God to us. It was a most unusual love note. The love note was different. It was not just the word of God written on dead paper. It was the word of God written on life itself. It lived and breathed. The love note was alive! It was written in the form of a baby born in the most humble of circumstances in the boondocks of time and space. It was inconspicuous, anonymous and remote. By all measures, it ought to have been overlooked but it was not.
Why was it not?
Because it came with a guarantee.
God did not just put the love note into our hands. God put a guarantee of its genuineness into our hands as well.
At Calvary, His love for us was put to the test. Contrary to normal expectations, we baptized him (Matthew 3:13-17). If the love note were counterfeit, his love for us would have faded as we tortured him and died when we killed him. But it did not. It survived. The evil we did to him did not extinguish his love for us nor reduce it by even the slightest degree.
The dial that controls his love for us is in his hands not ours. Moreover, it is set to the highest degree and is locked in place.
That his love for us survived intact and undiminished the evil we did to us is the guarantee that the love note is genuine.