I don't know. Maybe if their shoes are as comfortable as they say, there are some USPS employees walking around in new pairs of shoes. Also, why would you want to draw attention to a package? If it seems unusual in any way, they'd be inclined to give it more attention and perhaps inspect it, no? This smacks of marketing to me. Intentionally "edgy" branding and then poking some fun at the ol' sticks in the mud in Bible Thumping America is right up the alley of some people that might be interested in buying hip, German, Atheist brand shoes, don't you think? Edit: I do wonder if they are comfortable though. They look nice, if precious. The names for the products are pretty awful too.
They certainly look nice, but yeah, I don't see the point in wearing shoes that declare your religious non-affiliation.