The sin of Adam is still with us, and cannot be denied. If you could persuade me that you were not dying then l would have reason to believe that you were without sin, but the truth is you are dying!
Death is the reality that you and l have to consider. I assume that you have given up on all hope of eternal life, but for me the hope remains. I see that if there is to be eternal life, it cannot come from man. It has to come from God.
Your hopelessness is rooted in a conclusion that you have reached, and to which you cling doggedly. Your conclusion is that God cannot be the Creator, which, in my view, is a poor conclusion to reach given the evidence found in nature, in man, and in the Bible.
As an atheist, rather than an agnostic, you should be able to provide good reasons for God not existing, but this l do not see in your posts.