God has stated clearly the purpose in His creation of mankind. God wants man in His image! Each covenant teaches, reveals and directs man in the steps toward God. No covenant ever ends but is fulfilledd and contained within the next covenant that moves closer to bringing man into God's purpose for him. (I am not a feminist and am comfortable in calling all humans "man", and speaking of God as He!)
We see God's purpose for the Church in the covenant Jesus has given us, in Ephesians 1:3-10.
Holman Christian Standard Bible (HCSB) 3 Praise the God and Father of our Lord Jesus Christ, who has blessed us in Christ with every spiritual blessing in the heavens. 4 For He chose us in Him, before the foundation of the world, to be holy and blameless in His sight. In love 5 He predestined us to be adopted through Jesus Christ for Himself, according to His favor and will, 6 to the praise of His glorious grace that He favored us with in the Beloved. 7 We have redemption in Him through His blood, the forgiveness of our trespasses, according to the riches of His grace 8 that He lavished on us with all wisdom and understanding. 9 He made known to us the mystery of His will, according to His good pleasure that He planned in Him 10 for the administration of the days of fulfillment—to bring everything together in the Messiah, both things in heaven and things on earth in Him. Before creation, even before the creation of angelic beings, God purposed our destiny. Everything has been created to achieve His purpose. He has revealed His love and care in the creation of our habitation. This earth is an expression of His love and understanding of our needs. Jesus is an expression of God's love and we have a High Priest Who understands our needs.
We are not alone on this journey. God has freely given of His Being for He has provided the way to impart to us of Himself. But covenant makes everything very personal and individual. There is a separation that is necessary to covenant. Jesus prayed that, though we are in this world but not of it, (even as He was not of it!) we be protected from "the evil one." He has a purpose to use us to reveal Himself to the world, as lights in a dark place. He answers our covenant response with a deepening measure of His provision to bring us into His glory. Separated to Him, we do not have a form of godliness while denying the power thereof. We walk in fellowship with Him, our lives flowing with His and His Life flowing into us. He sees us, in our response to Him, as holy and blameless!