I don’t think I would ever wear this shirt in public, just because cramming my views about God (or lack thereof) down people’s throats is just as obnoxious as others cramming their views about God down my throat. That being said, I do find the Atheist Bus Campaign and the controversy around it very interesting. As far as I know the campaign is solely in the UK, and I’m not going to talk about it much here, but if you’re interested, you can check out their website.
And hell, I think the most important part of this shirt is the last two lines. They far eclipse any feelings I have towards the first two.