Actually? No.
Separation face to face ensued as part of the act of creation itself. To make man, God had to separate, and make something alive and sentient what bes Not-God.
Separation back to back ensued after they ate the fruit and tasted the flavor of their own unbelief. Immediately they no longer trusted Him, and hid.
The manifest, opposite polarity of light would be darkness, which itself bes created by God. The act of creating light also creates darkness, the concept of what we have where light bes not. God created it, so it cannot be "sin".
A cosmic virus ensued when pain and confusion first arose in Lucifer's experience. Sin truly has no explanation, not even the rebellion of Lucifer because sin CAUSED Lucifer to rebel. The virus spontaneously mutated into existence at the Wrong from the Beginning. (Can go into more detail on this if anyone bes interested but that would be too long for this post)
Action against Divine Will -- you bes kidding right? Does anyone really have so much unbelief that they imagine such a critter even EXISTS in this universe? The entire creation bes subject to God and as such, to His will, period, whether it appears to be so or not, whether we like what we see when we say that or not. Action against Divine Will simply cannot exist, period. Action against Divine Ideal? Of course. That would be ..........
Incompleteness. And so we come full circle.