When someone says something DOES NOT EXIST, it's the SAME THING as saying SOMETHING DOES EXIST. It's a definitive. It is a statement of fact that needs backing up. People that say God exists have just as much burden of proof as someone who says God doesn't exist.
The bulk of religion is stubborn. But they aren't Science based so it should be no surprise to anyone. It's shocking to see Scientists saying that something cannot exist even though they can't say for certain whether it does or doesn't. Hell, the Giant Squid didn't exist 50 years ago and some in the Scientific community thought it was just a tall tale or mythology and flicked their nose at it. Then one is caught and slaps them in the face and they give credence to it. Just bite your tongue and say, it's a possibility but I would need proof. That's it. No badass Scientists riding in with Oakleys on Segways. It's possible but not probable. THE END.