Read 1 John 1.
Our faith is primarily about God. He is our Creator; we belong to him and are accountable to him for how we live this life. Due to Adam’s choice to sin, none of us is capable of pleasing God by living up to his perfect righteous standard for how to live and worshipping him wholeheartedly. As a result, we are under his wrath and hopelessly lost for eternity. But, because of his love and mercy, God the Son came into the world to live a perfect life and die as the perfect sacrifice for our sins. Once we trust in him by faith, God credits his perfect righteousness to us–we call this justification. At the same time, he credits us with the death of Christ and, on that basis, forgives us for our sins based on the death and resurrection of Jesus for us.
More could be said, but that’s a basic outline of our faith. The major goal of it is to glorify God by reconciling us sinners to him through Christ. That reconciliation is the major benefit to us of God’s grace in the Christian faith and the end result of that reconciliation is eternal life.
But there are other benefits to being a Christian and John led off with one of them here in 1 John 1:3 when he wrote, “We proclaim to you what we have seen and heard, so that you also may have fellowship with us….” To put this verse in other words, John wrote about the gospel so that (among other things) the readers might have fellowship with John and all other Christians.
The word “fellowship” is a much-used, little-understood word in Christianity. Its basic meaning is “sharing.” When we talk about it as a core result of being a Christian, it means that we share a new kind of relationship with other Christians. It is a kind of relationship that non-Christians are not capable of having because it is a spiritual relationship, a deep bond that genuine believers in Christ share.
And why do we share this deep bond? It is because we are all connected in a “fellowship” relationship with God. As John wrote in the latter half of verse 3, “And our fellowship is with the Father and with his Son, Jesus Christ.” It is God’s grace to us in Christ that connects us to the Triune God, giving us a new fellowship–a family relationship with God that we never had before Christ and could not have without him. Because we all share that, we now have a basis for sharing a deep connection to one another in Christ.
The result of Christian fellowship is joy; according to verse 4, “We write this to make our joy complete.” The rest of this letter is going to spell out the marks of genuine faith in Christ, starting with truth (“…walk[ing] in the light,” v. 7a). But before describing what a genuine Christian looks like, John began with one of the motives Christians have for sharing the gospel–“so that you also may have fellowship with us” (v. 3b).
Do you want a deeper friendship, a stronger, more spiritual connection to other people? Then share the gospel with others! The salvation we share by God’s grace is the only true common ground that can unite humanity. It–and only it–can bridge cultures, languages, ethnic backgrounds, and anything else that divides humanity. This is not the only reason to give the gospel, or even the main reason, but it is an important one. Faith in Christ unites those who belong to Christ and gives us a basis for true fellowship. The more we reach others with Christ, the greater and broader and deeper our connection to other people will become.