"As our Church grows larger, we have to think smaller."
Small Groups are the answer to growing Sunday morning numbers. In the context of a small group you'll get to know people well enough to "be the Church" with them. We are designed for dependence upon authentic, biblical relationships. A Christ-centered environment of growth and accountability is key to a thriving Christian life.
If the idea of accountability is intimidating consider the cost for not being held accountable. Also remember that small Groups are made up of fellow sinners, as much in need of Christ's redeeming power as you. They too are designed to need Christian community; you need them, and they need you.