'In Christ' in the Bible

For [no matter] how many promises God has made, in Christ [the answer] is "yes" [i.e., Christ has fulfilled all of God's promises to mankind]. Also, through Christ, the "amen" [Note: This word is always translated elsewhere as "May it be so"] can be said by us in order to honor God.

For we [apostles] are not like so many people, who "peddle" God's message merely for profit [or, "who corrupt God's message"], but in Christ's [service] we proclaim the message from God with sincerity, [realizing we are] in the presence of God.

That is, God was in Christ restoring the world to fellowship with Himself, not counting people's sins against them. And He entrusted to us the message of restoring people to fellowship [with Him].