Though I agree his avatar is in the worst possible taste, isn't funny, and was posted for the sole purpose of getting the goats of Christians, I won't join the chorus demanding he be censored and/or censured for his misbehavior.
Here's an offensive cartoon that's much funnier than the obnoxious provocation posted by CanadaSucks, and much more to the point as well... http://www.ep.tc/realist/48/26.jpg