Atheists deserve freedom of speech

I saw over at the Des Moines Register that Des Moines Area Rapid Transit (DART) has pulled ads placed by an atheist group off their buses. The ads said:

Don't believe in God? You are not alone.

The ads were sponsored by a group called Iowa Atheists & Freethinkers. According to the Register, DART began receiving complaints as soon as the ads went up. As a Christian, I don't see the ad as offensive. The Bible tells me that there are people who don't believe in God. They are indeed not alone.

My concern is that if DART can reject their ad because of complaints over its religious content, perhaps my ad will be next. For example how about an ad like: