Virginia Knight wrote:

>I don't really know what the difference between a Catholic and Protestant
>requiem might be, apart from the source of the text set.  Neither part of
>the Church has a monopoly on a dread of final judgement, or expectation of
>a blessed afterlife.

When Mozart's Requiem became popular - which was shortly after his death -
in Northern Germany editions with German text substituted for the Latin
text appeared, to make the work suitable for performance in Lutheran
liturgy.  I don't know, however, whether it was a plain translation or not.
But it had to be in German.

-Margaret Mikulska