I understand the point they're trying to make - I really, really do - and a bench is a pretty respectful thing, but the part of me just can't help but think they're not helping.
This. So much this.
I think we should work to make atheism as valid and acceptable of a philosophy as any religion in the general public's eye, and exercising the right to erect monuments and such is a good way to do it. (For the time being, at least. In the long run, I think monuments to non-belief are kind of missing the point.

) But the way they're going about it here feels like
at best fighting on the same level.
It also has a list of Old Testament punishments for violating the Ten Commandments, including death and stoning.
This in particular is just antagonistic. I like pointing out logical failings of holy texts as much as the next guy, but I don't think it's the sort of stuff you engrave in stone to last forever; it's just low-brow. The whole thing is a nice idea that just reeks of smug redditor-style internet atheism and makes me want to distance myself from the actual label "atheist" much like Neil Tyson does.
If it were up to me, I'd rather go the subversive route. Put up a sculpture celebrating the beauty of nature or something, and then when people stroll over to take a closer look, it has a small plaque with one of the nicer secular quotes on it and "donated by American Atheists". We should push the positives, like helping your fellow man for its own sake and appreciating the inherent wonder of the universe, rather than have a pissing match about who's more wrong.
e: Also, the "capital A and hundred year old atomic model" logo is dumb.
e2: I missed the picture section. Looks like they got a couple good quotes on there, but I still say it's tacky overall.
