People leave the church. The dropout issue is well known and discussed widely. Perhaps less known is the high rate of young adult dropouts. Our research reveals that over two-thirds of 18-22 year-olds leave the church. In the short, four-year transitional window of teen to adult, the church loses the majority of its students.

Most of the dropouts do not leave their families during this time. Most of the dropouts do not leave their social networks during this time. Most of the dropouts do not leave the educational system during this time. But most of them leave the church.

The excuse that the secular society has more to offer than the church simply does not pass muster. Let's look at four keys that our research shows are critical to keeping young adults.

1. Keep them with biblical depth

Young adults are more likely to stay in church if they are taught the truths of God's Word. Biblical depth has a sticky quality. Christians who hear sound sermons each week, who are involved in small group Bible study, and who study the Bible on their own rarely drop out. Biblical depth also has an attractional quality. Spiritual seekers are most drawn to churches that maintain this culture of solid preaching and encouragement to study the Word of God. Go deep. Get excited about diving into the Word. And watch God work in not only the younger generation, but with all ages.

2. Keep them with high expectations

Too much of recent American church history has been one of low-expectations. Because the local church is comprised mostly of volunteers, leadership has been reticent to create an environment and attitude of high expectations. As a consequence, membership expectations have been communicated with extreme caution, if at all, lest the members become offended and leave.

This low-expectation environment has been normative for many of the churches in which young adults have attended. Most of them have heard very little, if any, of what is expected of them as a church member. As a consequence they have seen church as a low priority or even optional.

Creating a culture of high expectations is, in many ways, an intangible process. There are many ways to do it. But churches that have this environment of high expectations attract people who are on board with the purpose and mission of the church. Additionally, these churches are more likely to retain those who know upfront that much is expected.

3. Keep them with multiplication

Regardless of perspectives, two realities are clear. First, evangelism is not an option for Christians or for churches. The Great Commission is a mandate. Second, every church we have studied that is effectively reaching and retaining young adults is highly intentional about evangelism. They have a passion for multiplication. They get the action right. No exceptions. Period.

Churches with an outward focus are successful at retaining and reclaiming church dropouts for two main reasons. First, church dropouts are more likely to return to churches that are reaching out to them. Additionally, active churchgoing young adults have an understanding of what God requires of His people. Both groups have a desire to go to a church that is doing what God commands.

4. Keep them with simplicity

Our research has shown that many young people leave the church because they were never truly discipled. They may have been involved in a plethora of activities, but they weren't growing spiritually to be more like Christ. A church cannot be essential to people unless there is a clear structure guiding them along the discipleship process.

Biblical depth is more important than the discipleship structure of the church. But churches that do not have a structure in place cannot move people toward an understanding of this depth. A culture of high expectations is more important than the structure of a church. Without this structure, however, a church has difficulty communicating these expectations. A multiplying church is more important than the structure. But without structure, people do not know how to multiply. The right structure is not the most important facet of a church, but most churches cannot carry out their most important purposes because they do not have the right structure.

Churches that keep young adults get the content right-biblical depth. They get the attitude right-high expectations. They get the action right-multiplication. And these churches get the structure right-simplicity.

Sam S. Rainer III serves as president of Rainer Research, a firm dedicated to providing answers for better church health. He also serves as senior pastor at First Baptist Church, Murray, Kentucky. Sam is co-author of Essential Church and a consulting editor at Outreach magazine. He is a frequent conference speaker on church health issues. Sam loves hanging out with friends and family, enjoying all that the Bluegrass State has to offer.