I do not need to do experiments in Miami to know that I am not there, when I already know I am in Toledo. This proving a negative thing is a fallacy. That there is no MCT (this MCT) in Miami is a negative statement that I can both prove and that I do not need to prove to have contextual valid and certain knowledge that I am not there, if I know other things, which I do. The same way with god, I know he cannot exist because I know about identity, causality, reason and logic. I do not need to do extra experiements. I do not need additional proof. And neither should you.
If I knew that God exists (as you know you exist), that God is in Mexico getting ready for the Day of the Dead (as you know you are in Toledo, then I could prove that God isn't in Western Finland training reindeer (as you can prove you aren't in Miami).
No. When our molecules are broken down after death, we will not be living on as anything. Our molecules come from stars, but our molecules need a particular configuration to be life. Life ends at death. You should keep in mind that metaphor is not a sufficient source of knowledge. You cannot validly say we will live on as star-dust because it makes you feel warm and fuzzy inside. Life stops at death. There is no living on in metaphors.