6 Add thou not unto his words,
Lest he reprove thee, and thou be found a liar.
Proverbs 30:6.
3 But of the fruit of the tree which is in the midst of the garden, God hath said, Ye shall not eat of it, neither shall ye touch it, lest ye die. Genesis 3:3.
Did God say anything about not touching the Tree? No. So, Adam may have - and it's reasonable to conclude - but Eve definitely added to God's Word.
Lying is a sin. The existence of "Thou shalt not" in the Garden (to Adam) is proof man was created a sinner, which is why he sinned. Sin does not come from holy. The last Adam proved this. Christ was Holy, Christ was Righteous and He did no sin.
Isaiah states "There is only ONE God; there is NONE like Him; He gives His glory to NO ONE." Now, with this in hand what was the creative 'make-up' of Adam? Was he holy? Yes? Then God gave him His glory. Was he sinless? If yes, then God gave him His glory and Isaiah is a false prophet for lying.
There's only one of two ways to look at this. Either Adam sinned because he was a sinner, or he is a sinner because he sinned. Be careful. The first statement upholds the Doctrine of Imputation; the second statement doesn't.
Yes, he was. God cannot reduplicate Himself in Himself nor can He reduplicate any aspect of His Nature in created matter.
The devil doesn't control death. He is under the same judgment of sorts as man is. Death is the punishment for sin, not the devil. Besides this, "devil" is an adjective. You can't make it a noun or pronoun.