Church is about Connecting People
The better your church is at helping people find these significant relationships, the larger your church will grow.
If your church has a large percentage of adults that just come to weekend services but never connect with others in a smaller setting, then it is only a matter of time before they will leave the church.
You must be able to identify those who are not in a group and intentionally pursue them. This can be done via targeted communications but also passively via your website.
Experience the integrated church software suitethat will help you accomplish your goals.