"The New Testament is clear, believers in Christ make up the body of Christ."
Each member has been given gifts by the Holy Spirit that we are to use to build up and encourage the body of Christ to the glory of God. We are also called children of God with the same heavenly Father, and so we are brothers and sisters in Jesus Christ. Both of these truths of who we are in Jesus emphasize familiarity, closeness, unity and an intimacy in which we are able to minister to the needs of one another.
The children of God are those who truly love one another, and this is seen in caring for one another and encouraging one another to grow in Jesus Christ. This kind of love, ministry, and intimacy can be best accomplished in a context where people truly know each other. We believe this is one of the reasons why the New Testament gives such a high priority to meeting in homes. The New Testament models and mandates small groups as the norm and pattern for fellowship, the ministry of spiritual gifts, as ways of meeting needs, and as points of contact for reaching a lost world. We are called to not forsake the assembling together so that we can encourage one another.
For a believer to be healthy, growing, and fruitful in their life, they need others and not to live in isolation. God has composed the body of Christ, the church, to need one another to accomplish His purposes.