I'm agnostic and I don't like evangelical atheism. Or indeed evangelical anything. No one knows for sure so don't ram it down peoples throats.
To say, "No one knows for sure," is to mimic the intellectual dishonesty of the religionists.
It's like saying, "You don't know
for sure that there's not an alligator hiding under your bed, so I'm not going to take my shoes off." But no, actually it's not even that reasonable a statement. There is a zoo in Washington, they have an alligator exhibit, the entire staff could have gone on strike and left all the enclosures unlocked in protest, an alligator could have crawled 25 miles north without being spotted by the police or squashed by a truck, my housemate could have left the front door open, he could have come down the stairs and hidden under the bed, and along the way he could have captured and eaten a deer so my dogs are still alive and I didn't immediately wonder why they didn't run to the door to greet me when we arrived.
The chances of this happening are infinitesimal, but it is
possible. It doesn't violate any of the laws of nature that we have spent half a millennium carefully discovering.
To say, "You don't know for sure that there is no god," does not fall into that same category. The existence of an invisible, illogical supernatural universe, from which creatures capriciously wield forces that interfere with the behavior of the natural universe, violates the fundamental premise of science, which is that the natural universe is a closed system whose behavior can be predicted by theories derived logically from empirical observation of its present and past behavior. This premise has been tested and peer-reviewed aggressively and exhaustively for half a millennium, and has never come close to being falsified. All of our meticulously accumulated empirical evidence about the behavior of the universe supports this premise. To gainsay it is to reject science.
So to say, "You don't know there is no god so there could be one," is as disingenuous as saying, "You don't know there is no Santa Claus, La Llorona, or Fraggle Rock, so there could be one."
To postulate the existence of something for which there is absolutely no evidence, and then fabricate an entire gallery of supernatural creatures and a history of supernatural events around it, and then proselytize a code of behavior designed to please one of those imaginary creatures, is a sophomoric exercise. A great way to waste time and energy that could be spent learning how the natural universe actually works and making a positive contribution to civilization.