Although there are many blog posts and books written on the subject of keeping young adults in church after they graduate high school, I want to narrow the solution down to four practical solutions for churches to adapt in order to keep young adults in church when they graduate.
Sam Rainer who has been heavily involved in the study of the millennials with Lifeway records that students who hear sound sermons each week, are involved in a small group Bible study, and those that study the Bible on their own are the ones who rarely drop out. I feel that church leaders for years have felt that the solution to keeping young adults in church is through really cool technology, relevancy, casual environment, and contemporary music. I am not against any of these things. In fact, all of the things listed are good things, but they cannot be the most important thing. In fact, millennials do like these things, but according to the research done by the Barna Group as well as Lifeway Research, we find that millennials value Biblical depth much more. Rainer’s challenge to church leaders: go deeper!
The second way to keep young people in church is through a mentorship program. It has been proven that teenagers who are being mentored and discipled by an adult are less likely to leave the church when they graduate high school. In fact, I believe that churches have gone away from a mentorship program in most cases. The best example that we find of a good mentorship program is in Scripture through the relationship of the Apostle Paul and young Timothy. The Baker Encyclopedia on the Bible described their relationship this way:
“The apostle Paul, undoubtedly Timothy’s spiritual father, refers to him as “my true child in the faith” (1 Tm 1:2); he perhaps converted Timothy on his first or second missionary journey. The son of a Greek (or gentile) father, Timothy was yet uncircumcised; however, when Paul decided to take Timothy with him on the second journey, he had him circumcised, so as not to hinder their missionary endeavors among the Jews. Timothy, who was “well-spoken of by the brethren at Lystra and Iconium” (Acts 16:2), became Paul’s companion and assistant on his second missionary journey at Lystra.
Here we see the Apostle Paul investing in the life of a young adult, Timothy. From this description of their relationship we find that Paul disciple Timothy, he challenged Timothy with practical ministry application, he ministered with Timothy, he did life with Timothy, and he gave leadership away to Timothy. That is a good mentorship program, and if this was done more frequently, I believe that it would reduce the rate of young adults leaving the church.
Connecting Earlier to the Local Church
In youth ministry, teenagers are usually involved in a heavy program. In fact, most youth ministries are programmatic in nature, almost to a fault. They can be so programmatic that they pull teenagers out of “big church” (what it is referred to by teenagers) and into the youth program. Then when students graduate out of the youth ministry, they do not know how to handle adult church, because they have not been exposed to the adult side of church. According to Lifeway’s Research, 20% of young adults left because they did not feel connected to the people in the church. Brad Waggoner, vice president of research and ministry development for Lifeway said this after they uncovered their research on the epidemic of young adults leaving the church: “Relationships are often the glue that keeps people in church or serves as the attraction to begin attending again following a period of absenteeism. Many people are deeply influenced by friends and loved ones. Church leaders should passionately and consistently challenge church members to maximize their influence with youth and young adults. Frequent and intentional contact can either prevent or counteract the tendency of some to drop out of church.” I think it is crucial to have teenagers in adult services regularly. Teenagers should be involved in serving in the local church. Teenagers should be allowed to usher, sing in the choir or through special music, play in the worship band, volunteer, etc. In other words, students should be involved. It is proven through Lifeway’s study that students who are involved and connected are much more likely to stay when they graduate high school.
Have a Singles Ministry
Many churches have absolutely nothing more than a Sunday school class for young adults. Some churches do not even have a class for that age; they just send the college students into classes with all of the adults. Now one could argue that placing them in adult classes can be healthy, and I tend to agree to a certain extent, but you have to have something that brings that group together. Sam Rainer lists several aspects of a good singles ministry that will keep young adults. First, the singles ministry must have Biblical depth. We are not going to spend much time here, because this was one of the overall themes of the entire church that needs to happen to retain young adults. Secondly, set high expectations. 96% of millennials say that they believe that they can do something great. 77% said that they are motivated to make a difference by serving others in society  this is great news for the rest of the world, because it is clear that the majority of the millennial generation wants to make a meaningful contribution to society. Therefore the singles ministry must set a high expectation to do something great if they want to keep young adults. Third, Rainer suggests keeping them with multiplication (evangelism). Rainer states that “every church we have studied that is effectively reaching and retaining young adults is highly intentional about evangelism.” Lastly, Rainer suggests keeping them through simplicity, namely discipleship. He challenges churches to possess a strategic discipleship structure.
Although these suggestions may seem simple, they can go a long way. The church must address the epidemic plaguing most churches. When churches address the epidemic, they will find that things must change, or the millennials will not attend their church. When young adults feel that the church is interested in making a difference, they will come.
 Sam Rainer, “Four Keys to Keeping Young Adults in Church.” Lifeway.com. http://www.lifeway.com/Article/four-keys-to-keeping-young-adults (Accessed June 12, 2015).
 Walter A. Elwell and Barry J. Beitzel, Baker Encyclopedia of the Bible (Grand Rapids, MI: Baker Book House, 1988), 2069.
 Thom Rainer and Jess Rainer, The Millennials: Connecting to America’s Largest Generation (Nashville, TN: B&H Publishing Group, 2011), 116.