Question: Why should Christ use the Church to save man?

Answer:

To let you know, there is a law of God concerning those who committed sin which states:

16 Fathers shall not be put to death for their children, nor children put to death for their fathers; each is to die for his own sin. (Deuteronomy 24:16, NIV)

We already knew that all men have sin:

12 Therefore, just as through one man sin entered the world, and death through sin, and thus death spread to all men, because all sinned— (Romans 5:12, NKJV)

And the wages of sin is death:

23 For the wages of sin is death, but the gift of God is eternal life in Christ Jesus our Lord. (Romans 6:23, NKJV)

So, Christ who never committed sin:

21 For to this you were called, because Christ also suffered for us,^[a] leaving us^[b] an example, that you should follow His steps:
22 “ Who committed no sin, Nor was deceit found in His mouth”;^[c] (I Peter 2:21-22, NKJV)

Built the Church:

18 And I also say to you that you are Peter, and on this rock I will build My church, and the gates of Hades shall not prevail against it. (Matthew 16:18, NKJV)

The Church is His body:

18 And He is the head of the body, the church, who is the beginning, the firstborn from the dead, that in all things He may have the preeminence. (Colossians 1:18, NKJV)

And in the eyes of God, Christ who is the head and the Church as His body is a one new man:

15 having abolished in His flesh the enmity, that is, the law of commandments contained in ordinances, so as to create in Himself one new man from the two, thus making peace, (Ephesians 2:15, NKJV)

So, it is righteous for Christ to die for the sin of those who are part of His Church:

21 For He made Him who knew no sin to be sin for us, that we might become the righteousness of God in Him. (II Corinthians 5:21, NKJV)

And to become the savior of the Church:

23 For the husband is head of the wife, as also Christ is head of the church; and He is the Savior of the body. (Ephesians 5:23, NKJV)

Because those men are already part of the His body:

4 For as we have many members in one body, but all the members do not have the same function, 5 so we, being many, are one body in Christ, and individually members of one another. (Romans 12:4-5, NKJV)

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