For the record, that's something that should be done primarily BY PARENTS, not by the church they take their kids to. While there is nothing wrong with attending a great church with creative communication of Truth, nothing can take the place of a mother or father reading a Bible story at bedtime or sharing something God has taught them. These are the lessons that our kids will remember.
But if you are like most imperfect and normal families, sometimes we miss the forest for the trees. We get so caught up in teaching our kids parts of the Bible that we forget to drive home some foundational, "big picture" things.
Trevin Wax posted last week about "Four Things Every Kid Needs to Know About the Bible." It serves as a great reminder of some fundamental things we need to make sure we are getting across to our kids.