Go therefore and make disciples of all nations
After our Lord Jesus Christ was raised from the dead, and as he was preparing to ascend to the Father, he gathered his disciples together to give them his mission for the church:
All authority in heaven and on earth has been given to me. Go therefore and make disciples of all nations, baptizing them in the name of the Father and of the Son and of the Holy Spirit, teaching them to observe all that I have commanded you. And behold, I am with you always, to the end of the age. ––Matthew 28:18-20
In short, the church's primary mission is to proclaim the wonderful news of what God has done for us through His son Jesus Christ and to teach his followers what this news means for their daily lives. This is our mission.