…but why must he come into an incarnation and lose memory, conscious memory of what he wants to do and then act in a way that he hopes to act?
Aiming toward living a life in faith is nothing more than releasing fear, and allowing that which is to be, to be. When we are going against our true nature, when we see ourselves separate from other-selves, when we see some people as “worthy” or “unworthy” of our love, acceptance or whatever other form love takes, it is simply nothing more than separation: fragmentation of myself.
Your “densities” are basically groupings of levels of complexity. The third density, which we together enjoy at this time, is the first density of self-aware entities, and its denizens begin to seek the lessons of love by making the initial choice as to their path or style of seeking and realizing that love. 3d = To know good and evil and then to die.