Therefore, as Adam brought about mortality, Christ brought about immortality and for those who accept Him, eternal life. But, if Adam had not partaken of the fruit, there would be no need for Jesus Christ, and Lucifer would never have had to display his incredible temper and prideful, rebellious personality.
The fall is the child of the creation and the atonement is the child of the fall (McConkie, A New Witness for the Article of Faith, pg. 81). Salvation was made available in and through the creation, the fall, and the atonement. These three are each part of one divine plan.