You don't even say the Our Father?
You don't see that as an instruction from the Lord?
We are further apart than I thought. Is this usual for other NCs as well?
The Model prayer or the Lord's Prayer (as NC's will variously refer to the Catholic Our Father) is likely the most well-known scriptural reference known to NC's, besides John 3:16 and Psalm 23.
It will, typically, be recited fairly regularly in the corporate worship of NC's, but usually is seen as a model for the christian's personal prayers to God, during which NC's, generally, strive to open their hearts to God in intimate and spontaneous (as opposed to memorized) communication.