What Should Sunday School/Children's Church Look Like?

A recent encouraging article in which Capitol Hill Baptist Church in Washington D.C. was featured contained this quote:

As morning light filters into a fourth-floor room on a Sunday, students huddle on tiered seats, listening to a lecture on substitutionary atonement. The teacher poses a tough question, but a hand shoots into the air, eager to answer with a recitation of the week's memory verse from I Peter 3:18: "For Christ died for sins once for all, the righteous for the unrighteous, to bring you to God."

Scholars and seminarians call this systematic theology. Kindergartners at CHBC just call it Sunday school.

This is what Sunday School/Children's Church should be. Lord, may it be so.