God calls us to obedience to take the Next Step of faith so that we learn to trust in Him, so that our faith will grow, so that when life hits us hard (and it will) we will naturally have that faith and trust; and with confidence can say My God Saves!!!
We are told in Chapter 15 to abide in Christ to make our home in Him. The Church is the body of Christ, His church is not brick and mortar or wood and stone but is made up of flesh and blood, believing, Christ followers. These believers are engaged in the activity of His Church, what we are called to do and that is to love God, love one another, and make disciples. The church does this by abiding in Him.