I see the obvious difference between banning atheism and banning the slandering of religious beliefs has already been pointed out. One could argue that screaming "Mohammed was a pedophile" in some places would be akin to yelling "fire" in a crowded theater, generally not beneficial to public safety.
The only way you could 'ban atheism' would be if you could some how enforce people's maintenance of belief in at least one god. Weird idea.
The only way you could 'ban atheism' would be if you could some how enforce people's maintenance of belief in at least one god. Weird idea.