If Luke went to the island to die why was there a map?
Maybe they suspected that Luke was looking for the First Jedi Temple, and the Church of the Force was the first group that actually figured out where that temple might be.
Luke need not be involved in the map’s creation.
I thought that the island was a super hidden place in an unknown region, since not even Han Solo, the guy that’s been flying around the entire galaxy for 60 years, knows any of the nearby system/planets.
But your explanation is good enough for me.