Because the church is the body of Christ, we cannot have communion with Christ without also communion with our fellow Christians. Fellowship within the family of God is one expression of communion with Christ. John says, “that which we have seen and heard we proclaim also to you, so that you too may have fellowship with us; and indeed our fellowship is with the Father and with his Son Jesus Christ” (1 John 1:3). That’s a remarkable statement. No matter how goofy or insignificant your church may seem, fellowship in that body of believers is fellowship with God. Those serious about communing with Christ will be diligent to share in fellowship with other Christians (Acts 2:42; Heb. 10:24-25). In more than a decade of pastoral ministry, I’ve never met a Christian who was healthier, more mature, and more active in ministry by being apart from the church. But I have found the opposite to be invariably true. The weakest Christians are those least connected to the body. and the less involved you are, the more disconnected those following you will be. The man who attempts Christianity without the church shoots himself in teh foot, shoots his children in the leg, and shoots his grandchildren in the heart.
– Kevin DeYoung, The Hole in Our Holiness, p. 132.