So are all words referring to religion obscene? Does this extend to all words describing any kind of minority which finds itself persecuted?

When people are persecuted for belonging to a minority this is not as being a member of a nameless generic category "minority', it is specifically as being a member of that specific minority, which has a specific name.

Once again, nobody in this thread has claimed that the only people who suffer persecution are Christians, or that where other groups are persecuted that is less important. To pretend otherwise is throughly dishonest.