A noble definition; but how does one tell when they are or aren't separated from God? What sort of feeling/s would one have?
-A
Sin can be defined direclty from the Bible.
Romans 5:12, 7:17; Psalm 51:5; Galations 3:22
Sin is a human condition after the Fall.
Rom. 14:23 But whoever has doubts is condemned if he eats, because the eating is not from faith. For whatever does not proceed from faith is sin.
Anything we do, if not done out of faith, is sin. This includes even eating and drinking, things that we would normally consider unimportant spiritually.
James 4:17 So whoever knows the right thing to do and fails to do it, for him it is sin.
Failure to do the right thing when we know what to do is sin.
Num. 14:22 none of the men who have seen my glory and my signs that I did in Egypt and in the wilderness, and yet have put me to the test these ten times and have not obeyed my voice,
To see the glory of God, and yet not respond in obedience.
Heb. 11:6 And without faith it is impossible to please him, for whoever would draw near to God must believe that he exists and that he rewards those who seek him.
Failure to recognize that God exists, and that he rewards those who seek him (in faith).
Psalm 37:4 Delight yourself in the LORD,
and he will give you the desires of your heart.
Since failing to obey God is a sin, and God commands that we delight ourselves in him, failure to delight in him is a sin.
You can see the very broad definition of sin presented by the Bible. It far surpasses the idea of individual actions, and includes a condition of mankind, heart attitudes, failure to act (inaction), to spurn the glory of god, or to fail to take joy in him as a rewarder of those who seek him.