Why is peace with God biblically said to be "through" Jesus --> Christ, only in Christ?

Why are we called the body of "Christ", not the body of Jesus?
Why is reconciliation to God done "in Christ", and not in Jesus?
Is it perhaps because Jesus brought division, and not peace?
Eg: Matthew 10:43... Luke 12:51... John 7:43... Hebrews 4:8.
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