The last Confirmation class I taught had a few kids in there who kinda felt that way, and openly challenged me to “prove it” that God exists. I admitted that while I can’t openly prove the existence of God, they couldn’t disprove it either, and that’s what faith truly is. There were a few who left it at that, probably shocked that I didn’t try to prove it to them from the Bible or some other source, but one in particular pressed on and asked how I can believe something without proof? I told him that I had proof, the Bible and writings of the ECFs that proclaim Jesus, but proof only works if one is willing to accept it. And really, that’s what it all boils down to. You can proclaim Jesus til your tongue falls out, but if no one wants to believe you or the proof that you give them, they’re not going to.
Teens today have it a million times harder than in past generations, even mine, and I’m a proud card carrying member of the dye-your-hair-blue-to-express-your-individualism-because-everyone-else-is-doing-it Generation X. The constant influx of information and media has their heads spinning like tops and the world is telling them that their life is their own, and not belonging to God, able to do with it whatever they please.
Be patient with them. I’d bet a lot of them are confused, trying to mix the messages they get from the media and the messages they get from you, and they just don’t jive, and they’re having to make a choice, sometimes for the first time in their lives. This isn’t just chocolate milk or white milk, this is the choice where they decide what they’re going to follow for the rest of their life. That’s some heavy stuff if you think about it. Pray for them, and hope that some of the seeds you plant now are able to fester and grow.