It has nothing to do with religion, but everything to do with free speech.
Hate speech is not covered under free speech!
We already have laws about hate speech in the real world.
Institutionalized "hate speech" is already not tolerated.
The problem is when you extend this rule to the internet, an area where you have anonymous people saying all kinds of things they wouldn't normally say in real life.
People acting like trolls, letting of steam, offending people, etc, the internet is a place where everyone is allowed to say (NOT DO) anything they want.
The danger is when you are setting a precedence to completely dismantle free speech,
just so that nobody gets "offended" anymore.That's why twitter is getting so much bad press lately for their weird "trust and safety council" they want to implement, which sounds like an orwellian nightmare.
Milo Yiannopoulos said it best in this short clip:
https://www.youtube.com/watch?v=D-3tiNIZB4QToughen up!Free speech is also about the freedom to offend other people's feelings.
Your feelings don't matter, what matters are facts.
And yes, ISIS is a terrorist organization.
But an internet troll is just an internet troll.
If he makes you feel bad, just block him, or ridicule him,
but don't ask for the internet to be censored.