Thinking a bit about Paul. (Failing hard at keeping up with the reading plan btw.) But thinking about what Paul said in Romans 15:
… 20 and thus I make it my ambition to preach the gospel, not where Christ has already been named, lest I build on someone else’s foundation, 21 but as it is written,
“Those who have never been told of him will see,
and those who have never heard will understand.” (ESV)
I know that missions often advocate preaching “where Christ was not known” (NIV) in a geographical sense. Paul was directed by the Holy Spirit to travel to new places he had not been to preach to those who have not heard. This is a huge principle in the vision for Asian or African missions. You travel to some place where there is a high concentration of people to whom Christ is not known. We think in a geographical way when ask the God’s fairness question, “What about those who haven’t heard?”
Hearing about and being at kids’ daycamps has made one thing clearer to me: Christ is not known to a high concentration of people demographically too.
Obviously there is a difference between kids without foundations and adults without foundations: you expect different levels and speeds of growth.