Ads and free speech

Do you believe in ads? Can they fix your faith? Can someone else advertise against your creed? Apparently it's a question.

I'm big on freedom of speech, and just as aware of the needs to curb it. However it's never easy to say who gets a say. The ad world is clearly not immune. Political ads are a frontrunner in line-walking between getting out a message and beating someone up.

Now the anti-religious world wants to advertise. According to Creativity-online there are those who want to post atheist messages on buses. And it's a legal question. Why? In the US, even the money has a faith-ad embedded in it. And what about Christmas? Has an ad right in its name. Should we ban the holiday, or change its name?

I'm not an atheist, but I can't see any reason to ban their ads. Can you?