One cannot deny the Atonement by making it conditional without denying the centrality of Christ. Works are more important than the Atonement for the LDS. Or, the Atonement is roughly equivalent to baptism as a requirement for salvation. (for Christians, baptism is an outward reflection of an internal commitment, not needed for salvation) Works are similar. They are an outward reflection of an inward commitment, they do not save.
Do you understand that works versus grace is a debate not just between Mormonism and mainstream Christianity, but within different mainstream sects as well - sects that I doubt anyone would contest calling Christian?
Or, the Atonement is roughly equivalent to baptism as a requirement for salvation. (for Christians, baptism is an outward reflection of an internal commitment, not needed for salvation) Works are similar. They are an outward reflection of an inward commitment, they do not save.
There are other mainstream Christian faiths that require certain ordinances for salvation, as well - notably Catholics. Are they Christian?
When your definition succeeds in eliminating mainstream faiths like Catholicism, there's probably something wrong with your definition.
I don't remember a ranking for Jesus the Christ. I know it was one of the books we were allowed to read as missionaries.