I am totally against insulting any religion.
It's everyone's right to choose his/her own beleifs.

By insulting others' beleifs, this will lead to nowhere as mentioned in the Quran:

{وَلاَ تَسُبُّواْ الَّذِينَ يَدْعُونَ مِن دُونِ اللّهِ فَيَسُبُّواْ اللّهَ عَدْواً بِغَيْرِ عِلْم}الأنعام108

And insult not those whom they (disbelievers) worship besides Allâh, lest they insult Allâh wrongfully without knowledge.