Continue to study your Bible and grow in understanding of your own beliefs. Knowing the facts behind your faith will help you stay true to it. I'm planning to go on a two-week missions trip to Mexico. Some of my relatives, including my dad, want to help me out financially, but they aren't Christians, and they're having trouble understanding why I'm going. They just don't understand, and I'm not sure how to respond.
Missions work is often a very difficult concept for a non-Christian to grasp.
You know the call from Christ is the call to serve. And you know that Christ gave us a mandate to preach the gospel to the entire world. You are doing what Jesus told us we would do. But I think it's easier for unbelievers to understand mission work when it involves serving in our own country or community. Here's how I would answer those who may not understand.