 I am thinking about the walls of Zion. I think of the walls as orthodoxy. The edges of Zion are the minimal foundations of our belief, our confession that Christ is Lord, or that the resurrection is literal, or that in the beginning God created. The side questions, like whether the creation was by six days of literal work or the miracle of theistic evolution, are not the point. The point is that God is Creator. The point is that stepping beyond that basic step, that wall, puts us beyond Zion.