I am saying you cannot make a law about what is offensive concerning religious stuff. Because it cannot be enforced in a fair manner that doesn't turn south. In true freedom of religion also religions that are offensive in nature towards other beliefs are protected. If the Christian says you will burn in hell because you don't embrace Christ that might be offensive and you are a fool for not seeing the truth. Any dominating religion can suppress other believes just by saying they find them offensive. Christians vs. Satanists for an example. One denomination against the other.You said there are limits, but nobody can draw these limits.
Is that what you are saying?
People have to work this out between themselves outside of courts. Offense in and of itself does not suffice for a state law. There would need to be some objectively measurable harm. There is the harm and offense principle in freedom of speech with especially the latter being really tricky ground. There is lots of judicial material concerning it on google scholar afaik my law classes lie a little while back. Offense is so tricky that many I listened to in the west think that way too much is already banned. If you can escape the offense like not clicking on a youtube link the consensus is nothing should be banned on those grounds.
A religious offense is too subjective to be objectively decided in court.
In many cases it is also not really that difficult to deal with it. If one doesn't like the australian comedian Jim Jeffries, nobody has to go to his shows or watch the youtube videos. Just because some people don't find it funny and only offensive doesn't mean it should be banned. The audience decides and if nobody finds it funny and pays than he will give up. The audience loves him. He bashes all religions equally. Christians more than the rest.
It is also not nice if an elementary pupil in school calls the other names but there won't be legal laws about it. There is a limit to what you can put into laws because laws can be misused. In a democracy the separation of powers, protection of minorities and the expression of opinions even dumb ones are essential. Which is why no sane person would consider Russia a democracy because democracy is not only voting every couple years, at least not the kind that is taught in any half decent law school around the world.