Free speech in the United Kingdom, 2015
Nowadays, you should be careful about what religion you call 'heathen', like a pastor found in Ireland:
"Heathen" is very often defined as a non-Christian religion, although numerous lexical works define it was Germanic religion, or a Norse religion. So this padre was correct in his definition, and if you are a good Christian, any religion except your own is "satanic". And this is, according to a court, a crime:
Now, what about all these sermons by muslim 'hate preachers'? Don't they say anything that is 'grossly offensive'? Not if you're a Christian preacher.
However, if you're a imam, you can preach about killing infidels and how your prophet 'consummated marriage' with a nine-year old, and that's not even 'offensive' or even 'grossly offensive'.
In a free society, you have to able to say things that some people deem 'grossly offensive', or that society is not really free.