Why do we need missionaries? Missionaries play an important part in sharing the Gospel with people. Without missionaries in the world less people would hear the Gospel. Especially in places where Christianity is not allowed.
Global Frontier Missions states, “It is estimated that of the 7.47 billion people alive in the world today, 3.15 billion of them live in unreached people groups with little or no access to the Gospel of Jesus Christ. According to Joshua Project, there are approximately 16800 unique people groups in the world with about 6900 of them considered unreached. The vast majority (95%) of these least reached groups exist in the 10/40 window and less than 10% of missionary work is done among these people…” (https://globalfrontiermissions.org/gfm-101-missions-course/the-unreached-peoples-and-their-role-in-the-great-commission/)
The 10/40 window consists of Asia, Africa and the Middle East. How many people do you know actually go into the world and share the good news of Jesus?