No you don't, you fight their fire by showing the public that your group isn't bad, and look at the good things you do too even though it's not in the name of religion. You tell people if they don't believe not to be ashamed because it doesn't make you bad.
You don't shove it down their fucking throat and say "Yeah you're some fairy tale faggot if you're even remotely religious". Do you seriously think that's going to make people appreciate your views?
It works for any other religious point of view right? Why is this so much different?
Because you're atheist doesn't mean you can't express your views. The message needs to be spread so that people stop getting taken in by these religious bigotries.