Some would argue that in an unequal world, religion serves the powerful. Hence the famous saying that religion is the opiate of the masses. That certainly seems more plausible than mocking serving the powerful. There are probably governments out there right now which use a religion as the basis of their law and oppress their people. Religion is huge and powerful and absolutely must not be above criticism and mocking. The refusal, then, to let any religion stand above criticism and mocking, would serve the downtrodden.
However, since that article failed to actually make a case for why mocking serves the powerful, I'm not sure it is worth making a counterpoint. It is an empty statement with nothing to argue against.
To go back to an earlier point, I have no idea how people who stretch themselves past the breaking point trying to say religion is above mocking can be so lacking in self reflection. Religion, by all accounts, is one of the most offensive things humans have created. I'm not saying it's evil, or even that the good resulting from religion has not outweighed the bad. I'm simply saying it is offensive. The views expressed in religious texts, and by many religious people, on women, slaves, beating, punishment, etc, are extremely offensive. Freedom of offensive speech is the cornerstone of religious freedom. By fighting against it you would be disclaiming your own freedom of religion.