"Discrimination against atheists is very real, and very widely accepted."
No it's not. I'm an atheist. In Kansas. The last time I felt discriminated against was when I was in college, because finding ways to be the victim of perceived intolerance/discrimination is something that most high school and college kids, including me at that age, excel at.
I've been in the corporate world for nearly 10 years. I don't bring up religion at all and few of my coworkers have ever brought it up either. At my last employer, where I spent over 7 years, I got promoted twice. Not once did a superior ever ask where I went to church, or if I went to church, or anything of the sort.
Here's an uncomfortable truth: we're assholes in religious discussions. Wearing a colander to mock religious people is being an asshole. I know, I used to be one. Then I grew up and realized that alienating friends and potential friends over an issue that can usually be left as "agree to disagree" is a dumb long-term strategy. Perhaps if we atheists would quit treating believers as simple-minded rednecks we'd see a fair amount of that alleged discrimination go away.