Should Russian feminist punks have been jailed?

Even after 70 years of Communism, Russia is a very religious place,  so it attracted a lot of attention when a punk band called  "Pussy Riot" invaded Moscow's main cathedral, mounted one of the holiest places in it, and performed an obscene  song critical of the Russian Orthodox church and of Vladimir Putin, Russia's prime minister at the time.  Words of the "song" are here.

This was very disturbing to worshippers who were present and security guards promptly grabbed the band members and hustled them away. 

The performers  were arrested and charged with “hooliganism motivated by religious hatred” and got 2 years' jail, which in Russia probably MEANS 2 years' jail.

There have been many expressions of support for the band in the Western world but much of that is probably motivated by a dislike of Mr Putin, who is undoubtedly something of a tyrant.  Even more unforgiveable (to the Left) he is also a patriotic Christian who attends church regularly

What would have happened if the band had done something similar in a mosque?  In Pakistan they would be dead now;  In Britain they would be in prison and in the USA they would probably have been given some small penalty for "trespass" or the like.

If Muslims are entitled to respect for their holy places, it seems to me that Russian Orthodox people should have similar rights.  I see the matter as not about speech but about behaviour and that is indeed how the Russian  prosecutors charged them.

When people are allowed to invade mosques and put on performances  offensive to the worshippers, then I will see the prison sentences in this matter as excessive.

British Libertarian writer Sean Gabb argues that the sentence is not excessive.