Well, being a recent former teenager myself and someone who works closely with teens in the church, I figured I would weigh in.
It has been my experience, and in talking with others whom I went through the church with, that the temptations of the world can and will weigh all too heavily upon the shoulders of the youth. It is no secret that between the ages of 12-19 young people go through some dramatical changes. One of those changes and one of those things that arise if the need to be loved and accepted. Where the church rejects and fails to show such love and acceptance, the world steps in and however vainly, fills that gap in. Sometimes the church does it accidentally. As with teens, cliquey groups form and can unintentionally, as well as intentionally, hurt the feelings of "outsiders" or newcomers into the youth ministry or the church. It usually seems that junior high kids are easier to reel in with goofy games nights or overnighters at some extravagant places, and in my congregation we have confirmation in 7th and 8th grade so the education and instruction is still something they are going through so they seem to stick around. A big fall out point, although currently at home that trend seems to be changing, is around the beginning of high school kids seems to fall off. As with growing and maturing kids go through physical changes and in junior high we can be awfully awkward looking. The church, with the matured high school group and the junior highers tend to accept these kids because well they are all seemingly in this thing together. The problem arises whereas these kids are being rejected in Jr. High seem to come into their own, if you will, by high school. Or for those that don't are still for some reason so desperate for attention that they will do anything or try anything to be accepted. And this is where the glorious temptation of sex, drugs, and rock 'n roll come into play. Personally, I have not found the problem to be so much the church rejecting or the church overkilling with law, but rather this funny thing we call temptation and sin comes knocking rather rapidly at the door of the youth. Kids in Jr. high and High School brag about many things, and one of them being how they haven't been to church in years if the topic casually comes up. Then the weekly goer looks ridiculous in front of his/her own peers. Then there is the camp that we call Chreasters who go twice a year on...you guessed it, Christmas and Easter. This concept of attending church every week is foreign and downright ridiculous to a lot of kids. So sin is the problem here, no surprise. But specifically, PARENTS of the kids who are lax on their children being brought up in a home with rich faith. Soccer games on Sunday mornings become more important than Church and Sunday School. And then baseball games as well, usually in the spring.
How the heck do we fight such things? Well when engaging youth/kids you have to come down to their level in some ways. You have to respect them for who they are while maintaining who you are as well. I would be lying if I said I haven't developed friendships with some of the youth, and that can be problematic for it has gotten me in some very minor situations, but the idea is to show the kids the same love and respect that you would want, that the church should give. At my congregation we have had a great youth director for over 15 years who has been able to go through the tumultuous changes of youth and the church to keep stability, and what is that stability? The Gospel of Jesus Christ. Never changing, ever fervent in love toward one another. Youth Ministry, although needing to teach correct things, is not a Cathechism Class, or Confirmation, or even "Church" itself. The one(s) in charge must stress the importance of being confirmed and going to church weekly to gain the Law and Gospel teaching alongside the Sacramental. "Youth Group" gives kids something to do and to be a part of, with a twist. Faith is involved. I am forever indebted to my church and my youth group for what it did in shaping my life. There are many times that I have failed in temptation (who doesn't?) but there are also many times I have found myself thinking of those I would congregate with in confirmation on thursday nights or specifically at Youth Group Sunday nights or on Wednesdays during the summer, and be led away from the temptation based on the fact I wouldn't want them engaging in the same activity, because as followers of Christ we are all above that. What's the answer behind all this? Show kids love, and teach correct things, if they are still not interested, there is only so much one can do. It does help to entice the younger ones with overnight events, goofy games nights, and etc to catch them. But it is always the Holy Spirit which does the reeling in.
Hope this makes some sense
M. Staneck