In a strange way, I've always admired the Jehovah Witnesses and other people of faith who went door to door to evangelize. That takes guts that I just don't have.
My father-in-law relished any knock on the door that challenged his Catholic beliefs. He would whip out his bible and go head-to-head with anyone who disagreed with the Church. It got to a point where the evangelists stopped coming. I think he was disappointed.
If you ask me about my faith, I will be glad to tell you why I converted and most importantly, stayed converted. My biggest frustration comes from those who claim to be Catholic, but do not practice.
Practice is the key word here. Here's a great quote from Fr. Benedict Groeschel, "One thing that is not being tried in any particularly enthusiastic way by people who call themselves Catholic is Catholicism." And from C. S. Lewis, "Some find it natural to approach God in solitude but we must also go to church."
The first step to actually practicing the faith is to get your rear end in the pew. Once you're there, open the missalette and follow along with the readings. Then the important part comes: Communion.
We are nourished by our Lord like no other denomination of Christianity. We believe in the body and blood of Christ! That will bring you as close to Jesus as you can get!
Adults usually like to do things well. You work hard at your career and balancing your family life. You might work hard on your house to get it just right, but what about your soul? Somewhere along the way to adulthood, the care of your soul slipped through the cracks.
Think about it. Decide to start attending Mass. Pick a time and the church that's most convenient for you. Check out the bulletin of that parish and see if there are things that you would like to participate in. Community is so important to growing in faith. The faith of others can help your own spiritual journey.
For me, convincing someone who is Catholic to go back to church is really difficult. I'd prefer to keep my mouth shut and hopefully, by the way I lead my life (mistakes and all) they may be intrigued enough to give it another try.
You can find out more about the new evangelization here.