How fallen are we?

When we talk of the depravity of fallen mankind, it is vital to try to comprehend what man lost through the fall. We should have clarity as to what man is now able to do and what he is unable to do. For example, we say that man is unable to save himself. Now, does he know that he needs salvation or is he completely unaware of this fact? Did the fall take away his capacity to seek God? Even if he seeks God, is it for purely selfish motives or is there a glimmer of light in him which he does not pay attention to?
When we read that he is dead in his sins, it is not dead in the sense of an inert being; but dead in the sense of being hostile to God and rebelling against Him.
The question therefore is – where is man in his fallenness? Sometimes, we place him on par with the devil with regards to evilness, which is a totally false understanding. Man is salvageable and the devil is not. Or at least, God has chosen not to. The devil is totally evil but man definitely not so. But what is the difference? How do we explain the workings of the conscience? Does man ignore the voice of the conscience always or at times? Is it that he tries to obey his conscience and succeeds at times but fails to do so when overly tested? Sometimes it is easy to obey the dictates of the conscience and feel good about it. It can be like a drug we take for our pain and getting relief from it, not knowing that the pain is due to cancer inside. Much of our obedience to the laws of God can be like an stimulant, but the reality is that we are basically a rebel to God. It is dangerous to assume that more obedience is taking us to a better place in God’s eyes.