Jesus said to GO, go into ALL the world and preach the gospel! The book of Revelation states that there will be saints gathered to Jesus that are from EVERY tribe, nation, kindred and tongue... This is our mission as the church of Jesus! It is to reach the world with the gospel and to bring the "fulness of the Gentiles" into the body of Christ!
Greg has that vision gripping his heart and he plans to move his family down to Mexico to try accomplish at least a small part of that mission! I really hope this conversation inspires your vision to get involved in some way!