Seek out a vibrant parish where you can find support for your own faith journey before trying to help your boys. Get deeply involved with sacramental prayer like the rosary and go to Adoration and confession.
Teens (and young adults) can sniff out pompous behavior and falseness better than older adults. How are they supposed to believe in God when a man that is supposed to lead their faith is pompous? How can you expect them to believe in the ways of the church when all they see is a leader who is aloof? Its hard enough for you…never mind young adults with not-yet-fully-developed brains.
Find young adult groups and make it easy for them to attend, realizing they may not like it and want to leave. Approach them at their level. Are they logical and need to argue it out? Are they emotional and need to have an experience where they feel something? Are they rooted and want deep, meaningful traditions to have their faith? Are steeped in relevantism? Are they interested in other religions(hinduism, etc)? Are they opposed to some sort of moral teaching? Are they exhausted in their spiritual journey? Each boy probably has separate and valid reasons for leaving the faith and to find out what each needs you need to attack the root of the problem, not focus on the fruit of the problem. (eg. not going to Mass).
