Good questions!

It's rife alright! A few examples jump to mind:

If I were in a Veterans Affairs hospital, I might have to watch the surgeon pray over my body before surgery, in a religion I don't believe in. And if I asked him to please stop praying, could I expect him to do his best after he opened me up?

Or, think of how easy it would be to claim that any personnel decision is retaliatory, if everyone is trying to convert you and you don’t go along.

Or, how loud will all the Christians bitch and moan when Muslims and others try to convert them?

But if I go back to work, I could create DOSE, the Department of Satan Enthusiasts, and infiltrate the entire "sanctimonious federal bureaucracy." So there's that.

Regarding your first question, atheism is definitely a religious topic. I might also say that my religious view is that there is no god. But we could quibble over definitions.