Two easy actions for secular culture...

.. that you can do today.

1. SIGN this petition, being presented to the White House, which asks that that "under God" clause be removed from the Pledge of Allegiance (which, as James Croft of the Harvard Humanist Chaplaincy pointed out, should really be asking that the Pledge be RESTORED to its original no-god form.)

2. SHARE your stories of discrimination against atheists, in order to raise awareness of this form of prejudice, and to show solidarity with others who are exposed to the same sort of bias. From The Friendly Atheist:

A writer from BBC News is working on an article about atheist discrimination in the workplace and it’d be great to tell some of our stories in the hopes that other people will understand what some atheists have had to deal with. The reporter writes, "I have seen a few stories on this site about people who felt excluded by their co-workers or even lost their job after expressing their beliefs. I would like to talk to people who have been through such an experience." In case you’re curious, the folks at Think Atheist have verified the posting — he is who he says he is." 

The writer's contact information can be found at this post on the Think Atheist forum.