Toby'sFriend said:
I guess that would depend on exactly what you mean by an "atheist blessing."
If it is simply a moment to collectively join thoughts in gratitude of togetherness or whatever, I can't imagine people would be all that anxious to damn you to hell over it.
If it is your prior example of wanting to recite an argument that demonstrates God doesn't exist --- well then that would also be extremely odd and inappropriate. I'm not sure exactly how the term "blessing" applies to that.
Well I mentioned earlier a benediction I gave at an honors award ceremony for my public high school--I did the togetherness thing and thanked a doctor who gave me meds to help me stop losing my voice so I could talk at the ceremony. I did not consider that an athetist blessing in the least since it was completely neutral in its presuppositions about the existence or nonexistence of a higher being and the nature of that being. So there was nothing in it that would go against the beliefs of any religion (unless some religion out there is against doctors.) I would call this a secular blessing.
An atheist blessing, on the other hand, would have to actually make presuppositions that are specific to atheism. For example: "Let us be thankful for the food we are about to eat and for this event. We know it is especially important to express our gratitude toward our fellow humans and the natural world for all of our blessings, for there exists no one and nothing else to thank. Let us make the most of our place in the natural world, to embrace the natural understandings of ourselves that the science (especially evolutionary science) has provided, and to resist the temptation to retreat from the natural to the supernatural when the going gets tough." (Of course it sounds weird, since atheists generally don't do blessings--since we don't think there's anyone to thank but other humans and the luck of the draw.) I would think a blessing of this type would not sit well with most people.
Here's an atheist prayer I found online (from a t-shirt):
Our brains, which art in our heads, treasured by thy name. Thy reasoning come. Thy best you can do be done on earth as it is. Give us this day new insight to help us resolve conflicts and ease pain. And lead us not into supernatural explanations; deliver us from denial of logic. For thine is the kingdom of reason, and even though thy powers are limited, and you're not always glorious, you are the best evolutionary adaptation we have for helping this earth now and forever and ever. So be it. (This one sounds weird to--who/what is the "thy"? I guess the human brain?)
Here is a Wiccan blessing I found:
Gratitude to the cosmos
"Gratitude to the cosmos
swirling masses of dancers
dancer atoms
dancer gasses
dancer people
dancer animal people
dancer rocks
dancer of endless possibility
dancing emptiness
dancing reaches
& dancing arcs of outer space
dancing of all things that have ever been
and will ever be
Gratitude to the cosmos
And blessings."
I honestly don't know what people would do if these type of prayers were conducted at an event like a public high school reunion. A few years ago one of my uncle's (by marriage) relatives was getting married and was having a Wiccan handfasting ceremony for their wedding. One of the other relatives called my aunt (both the other relative and my aunt are Catholic) and in an agitated voice asked if she was going to attend the ceremony. My aunt didn't understand why the relative was asking her this, but the relative went on to say that Wicca is satanic and there would probably be animal sacrafices and such so she and her husband were boycotting. My aunt didn't exactly believe this but she started to get nervous because she didn't know anything about Wicca, so she went to talk to her priest. He explained that Wicca isn't satanic and there would be no animal sacrafices and told my aunt that the Catholic Church had no objection to her attending the ceremony so long as, in addition to being happy for the couple, she somehow told them "I'd be happier if you had conducted your ceremony in the Catholic Church" (WHAT?!--she didn't actually do that of course!). Anyway, the point of all this was that the relatives who boycotted the wedding totally freaked out and refused to attend their loved one's wedding because of their distaste (and misunderstanding) of Wicca. And even my aunt who is generally a somewhat reasonable person was so easily influenced that she thought she needed a priest's permission to go to her loved one's wedding! If people react this way when it is their loved ones, I don't hold out much hope that people will react civily when it a stranger at a high school reunion who is asking them to participate in a Wiccan blessing.