A truly awkward question

This is, as you see, the Engel scale, which tries to explain and gauge individual progress on the spiritual journey. Looking at it this morning I asked myself whether the same scale might apply to churches as well as individuals. I sometimes think of alarming questions, and this one alarmed me very much. What if there are church congregations that are nominally Christian, but in their preaching and teaching, and in the understanding possessed by the members, fall somewhere below ten on the scale? If there are some churches that are pre-Christian on this scale, but calling themselves fully Christian, then that has big implications for church unity. How can we unify with a church that is something other than what we ourselves mean when we say "Christian"? For it is clear that we and they would mean different things by it, if we are above and they are below step ten. In the hypothetical pre-Christian churches I am talking about, disciple making would be absent...