Proof is certainly relative to the person.
I can quote sources about the world being round till I am blue in the face. But if you dont believe the sources or are stuck in your ways, the proof has no solid ground or basis but is just words, to you, put together to make sentences.
Just becuase there is supposed "scientific fact" doesnt make it fact. Even historical "fact." Even theory's are taken as "fact." Whats up with that? So in that you, unless you've done the study yourself, you have to have faith in the proof.
IN turn you have to have a certain faith in what you are believing. Faith can be defined as a confident belief in the truth, value, or trustworthiness of a person, IDEA, or THING. But it can also mean a belief that does not rest on logical proof or material evidence. IN which a theory is. And in the same respects faith can mean loyalty to a person or thing. Your loyal to your beliefs that there is no God, you will not stray from this. IN which belief means the mental act, condition, or habit of placing trust or confidence in another. For that you would believe that the scientists are doing the study exactly as it should be done and have findings that are truthful. But belief can also mean mental acceptance of and conviction in the truth, actuality, or validity of something. You feel that the proof you have is valid. If someone doesnt believe and doesnt view it as valid, its not proof to them. As you've shown from proof that I've shown to you, mentally I accept it, I have convicitoin in its truth, actuality and validity. As well, you turn to many sources becuase of this definition of faith something believed or accepted as true, especially a particular tenet or a body of tenets accepted by a group of persons. Because a Theory is abstract reasoning; speculation or an assumption based on limited information or knowledge; a conjecture. You have a theory that God doesnt exist, yet its unproven and based on speculation, assumption upon the beliefs of others, and have limited information and knowledge about god and his creations, as well your belief is based on information that is accepted as proof to you but is theory to the many, and untrue. To you you have conviction for it, you believe its valid to just say "there is no god, look at the world, look at the people, killing, war crime, violence," in which it boiled down to. Where as I dont "look at the world, and see satan behind the problem of disease, wars, violence, greed, but look at life itself and see that it was created by intelligence."
IN science you make an Educated Guess or a Theory about the conlusion of your scientific study. In which you can be wrong or right. You make a guess about god. But are you educated enough to make the guess and if so have you actually studied to find out the answer to prove to yourself the truth?