What is the only real education available in nations under idolatry?
The only real education available in nations under idolatry is through the priests. In such societies, the priests serve as the sole channel of instruction, so learning is confined to that religious system rather than offered through other means. That is the only education available.
Les explains this while discussing Moses being learned, or educated, in all the wisdom of the Egyptians (Acts 7:22). He asks whether one has seen the Dalai Lama or Buddhist monks in television news, then points out that in nations under that kind of idolatry, the only real education is through the priests. Les emphasizes that this is the only education available in such settings. The larger point is that teaching must be substantiated from Scripture, because what man says or thinks does not amount to anything.