I have been to the real third world countried such as Irian Jaya, Papa New Guine, and indiginous parts of the Amazon/Brazi/Brasil..they had not seen white people let alone Christians..
back in the early sixties misionaries went into New Guine and Irian Jaya and set up and maintained stations with air strips etc the only missionaries to do this was the Baptist and seven day adventists, in all of this country (and most is remote and will overgrow and return to jungle in ten days)they are the only ones to have done any REAL preaching work, some it cost them their lives...NOT one JW in all of Irian Jaya or New Guine, I asked every where I went and no one had even heard of them let alone met them...In bigger villages such as Mnt Hagen or Port morsbey lots were converted to Baptist beliefs.
In 99 I went up the amazon to indiginous tribes, all along the way we found seventh day "advantistas" seems this is the biggest religion along the way with missionaries, schools, churches.