You know the Jesus fish, the ichthus? It came about because Christians had to keep their religion secret. They would draw one half of the fish on the ground and if the other person completed the fish they knew they were free to talk about Jesus, bake sales, and banning gay marriage.
We need something like that! I mean, we need to live in a world where atheism is treated with the same respect that religions are, but we don't live in that world and have to compensate.
Do we have a symbol like that? Any suggestions on how we could make one?