Pope Francis states that there are limits to freedom of expression and that Faith should not be made fun of. I disagree, you should be legally allowed to express any opinion you truly believe in.
With this being said, it does not mean that there will not be any consequences. Often, there is a lot of backlash when an individual expresses ideas that offend others. Charlie Hebdo is an excellent example of backlash caused by an offensive comment. This brings me back to my argument. You should be able to say what you believe but should be prepared to defend yourself verbally, and in extreme cases such as the Charlie Hebdo attack, physically.
In the case of Charlie Hebdo, both the illustrator and the company have the right to publish comics that could be perceived as offensive. I feel that Charlie Hebdo was not aware of the consequences of the comics that they were publishing. This is where they could have avoided the attack.
This argument could be countered by saying that attacks could be prevented by legally limiting the extent to what opinions you can spread. This is an invalid argument as people are offended by a large variety of comments. Making offensive comments illegal will also prevent the public from making their opinions heard, which defeats the whole purpose of democracy.
In conclusion, it is impossible to stop people being offended even if laws preventing complete freedom of speech are implemented.