Why Lam Rim?

Why would Christians want to use the Lam Rim as a path of spiritual development? From my own experience I can give 3 reasons:

1. It is specifically oriented toward a process of spiritual growth, rather than mere memorization of texts or inculcation and recital of beliefs.
2. It is systematic, providing a comprehensive framework for organizing religious precepts (at least, in my experience, those of Christianity and Buddhism).
3. It is cumulative: Each step provides a base of knowledge, practice and motivation upon which the next step can be built.

"Four especially great facets" of the Lam Rim are listed by the Third Dalai Lama in his work Essence of Refined Gold (a highly recommended exposition of this work is the Dalai Lama's The Path to Enlightenment). In their original form, these facets apply just to the Buddhist path, but they can also be generalized as suitable goals for Christian spiritual development.

1. "It reveals how all the various doctrines of the Buddha are non-contradictory." If we consider Jesus to be an enlightened being, then we should be able to discover many ways in which the teachings of Jesus and Buddha are also non-contradictory.
2. "All the various teachings will be taken as personal advice." We should take it to heart when Jesus says "I have said these things to you so that my joy may be in you."
3. "The thought of Buddha will be easily found." The Apostle Paul says "Let the same mind be in you that was in Christ Jesus" (Philippians 1:5). It would be of great help to us to be able to discern what that mind was and is.
4. "The great mistake of abandoning a lineage of Dharma will spontaneously be arrested." A "lineage of Dharma" refers to a particular tradition of spiritual teachings. Christians also surely need that kind of help, as evidenced in the old hymn "Come, thou Fount of every blessing":

Oh, to grace how great a debtor
daily I'm constrained to be!
Let Thy goodness, like a fetter,
bind my wandering heart to Thee:
prone to wander, Lord, I feel it,
prone to leave the God I love;
here's my heart, O take and seal it;
seal it for Thy courts above.