The 2 preschools (in 2 different cities) DS6 went to were through churches, one a Methodist church, the other an Episcopal church. We weren't members of either (or Christian, really), but they were absolutely wonderful experiences for him. They were both playschools with very little academic content, I know they practiced their ABCs and maybe counting to 10, but there was no requirement of mastery and everything was done through play. They were also so much cheaper than the private alternatives we found since they were non-profit ministries of the church.