Bible Question: What was the First Sin?

At the risk of reiterating past sentiments, the 'first sin' as you have opened the topic with, must be narrowed to Human, or general?Man's - the species, not the gender - first sin was two fold, and clearly stated in the Word;
For Eve, her sin was allowing herself to be deceived. Knowing God's command, not to eat of the fruit, she choose the word of the Serpent over her Creator. (paraphrased, Gensis 3:13)
Adam's sin is somewhat of a touchy topic but, likewise, clearly stated. Genesis 3:17. He choose his wife over God and also defied God by eating of the fruit.Both committed the exact same 'sin.' Choosing the creation over the Creator; Defying His Command in order that they might benefit themselves.The 'general' first sin? Pride. Lucifer got the boot for having pride in himself, such that he thought he could ascend higher than God.

She was told by the Creator of all - and if not He, then her Husband, who had witnessed some part of creation, first hand (Genesis 2:8,9,19,20) - not to eat of the fruit. She chose to listen to the creation, believing him over the Creator.As to the deception, I could go into more depth, but such is not the premise of this debate. The point I am trying to make is thus; Eve knew the truth, knew the decree set forth by God. She lived with it on a daily basis, actively engaging the Creator and living with Him in relationship. She, however, chose a lie as an excuse to eat the fruit. She 'allowed' herself to be deceived when, knowing what the Command was, she convinced herself that the Serpent knew better than God.

I see your reasoning, sir, yet you do not see mine. You are concluding that knowing what is 'right' and what is 'wrong' is required in order to sin. It is not. Sin is disobedience to God. Period. Ignorance is not a defence.God told Adam and, it is implied, Eve not to eat of the fruit. Truth be told, it is irrelevant who told her, as the decree ultimately came from God. Whether she knew the reason why, is also irrelevant. Wether she could or could not comprehend that going against God would be 'wrong,' is irrelevant. She clearly states her 'knowledge' that God told her 'no.' She chose to ignore that command. She disobeyed God, and, ergo, sinned.Cause and effect, sir, is very simple and exists beyond a shadow of a doubt. I will admit that they did not, perhaps, know true sin until after eating the fruit. However, it does not change the fact that they defied a clear order from God. There can be no excuse for doing the exact opposite of an order. They cannot claim ignorance, they were told.Her decision was, indeed, an informed one. She knew the outcome of her decision, she knew the source of the command, she knew the command. I fail to see how this is an uninformed decision? Knowing all pertinent facts, she chose.Ignoring all this, your statements seem to indicate a belief that Adam and Eve were simpletons, with only a partly functioning brain, largely incapable of making decisions. They were not. They were perfect beings, unlike ourselves. But, again, that would be a discussion for another day.The point is, sir, she did not accept God's word. She did not accept His Command. She accepted the word of another. That is sin. Her knowledge of wether or not it was sin is moot. She sinned, followed shortly there after by her husband.