Not remotely true, that argument does defy logic 101. Arguing that you cannot find proof of something, does not prove that something does not exist. By that reasoning, infrared light didn't exist until a human discovered it. You are now definately failing horribly at any sense of logic on that one.
If God does not exist, please explain in scientific terms how you exist.. since your existence depends on prior existence.. and it depends on prior to that.. taking this back you eventually get something from nothing. Please explain in scientific terms how you get something from nothing.
Science cannot, and in fact requires as a fundamental construct that you can never have something from nothing. Therefore science itself could indeed prove the failure of a God, by proving that something could come from nothing without the need of a UC... of course to do that you have to defy every rule and law of science.. so therefor science could, but being as it is the wrong conclusion, cannot prove the non existence of God.
The fact you exist is evidence of God's existence, you can choose to not accept that, but until you can scientifically explain the UC... (something science cannot do) you don't have a leg to stand on.
If man did not exist, would God exist?