"...that they may know You, the only true God..." John 17:3
It is estimated that 6,542 of the 16, 232 people groups in the world are unreached with the gospel of Jesus Christ. That means roughly 40% of the people groups in this world are living spiritually dead.*
" How, then, can they call on the one they have not believed in? And how can they believe in the one of whom they have not heard?" Romans 10:14
Jesus chose us to take the gospel to the ends of the earth. We're it... there is no back-up plan. If we don't live out the Great Commission, how will the lost hear?
In order to live out the Great Commission we have understand what the Great Commission is.
"Go and make disciples of all nations..." Matthew 28:19.
Jesus didn't commission us to teach people the latest and greatest worship songs, make sure they pray with their eyes closed, or to do a building blitz so every community has a place to 'do church'. He said to make disciples. What's more... He showed us how to do that! In the context of daily life He met people where they were at and pointed them to God.
If we follow that blueprint there are no bells and whistles required; it's very simple. It's affordable, sustainable, and easily replicated. The Life cycle, once set in motion, will keep going, each disciple in turn discipling someone else until every nation, tribe, and tongue has heard.