Salvation of men does not begin with the Gospel. That is the end goal.
For, Titus 2:11 tells us the following....
"For the grace of God that brings salvation has appeared to all men."
God draws all men. Not all men accept.
God is not going to have someone sent to those whom reject Him.
But, all who reject were drawn by grace, of which they refused.
“You stiff-necked people! Your hearts and ears are still uncircumcised.
You are just like your ancestors: You always resist the Holy Spirit!" Acts 7:51
God only sends missionaries to where someone has been positive to His drawing....
Not all missionaries are led of the Spirit, and under legalism, will go where God sent no one.
No one is going to the Lake of Fire who is positive to the drawing of God...
grace and peace .........