Then Jesus said to his disciples, "If anyone would come after me, he must deny himself and take up his cross and follow me" Mathew 16:24

Our purpose is to carry out the Great Commission which Jesus Christ gave to the Church. To win the unsaved by the preaching of the Gospel of Jesus Christ.
John 3:16 - For God so loved the world that he gave his one and only Son, that whoever believes in him shall not perish but have eternal life.