Nakedness and God’s Lie, Cain, Evil Nature, Some Questions…

Adam Et Eve by Tamara De Lempicka Art Print Poster
Nakedness…
If it is true, as the Bible declares and theologians state, that the “sin” involved Adam and Eve being made conscious of their “nakedness” does this mean that God and the Serpent and the others that were around, were clothed?
God’s Lie…
We also find that God told a lie. Eve did eat of the “Tree,” but did not, as was warned, die. So how and why would a god that puts such currency in morality tell lies?
Cain…
We read that Cain, after Slaying Abel is banished forever by the Lord, but is then endowed with the “mark” to prevent anyone slaying him. But why would the Lord want Cain’s life spared? How would anyone know Cain’s past deeds and want to kill him and how could any “mark” matter one way or another? Is there a mark that denotes that one has committed fratricide? And furthermore, who would be in the position to kill Cain, since he and his parents were, supposedly, the only beings alive?
Evil Nature…
Why does God create mankind and then lamenting its supposed “evil” nature, proceed to destroy all his creations? And if, indeed, God wished to annihilate all he had created, why do it so to cause such pain and fear, as we read in the scriptures?
From the DVD: Atlantis, Alien Visitation & Genetic Manipulation by Michael Tsarion