Joey Gibson posted a comment here. So I went to his site and found a link to ZynAddSubFX, which states at the top of the page:
Please don't use this program to make music that is against God and Jesus Christ (eg. HeavyMetal, NewAge,..etc..). Realize that the only way to the Salvation is Jesus Christ. Please don't lose this chance and don't make others to lose it!
You know, this ought to be an option. Then if I switch off 'Christian Compliance', I wouldn't get certain features, like the ability to Save my document, for example. It only makes sense that non-Christian documents can't be saved.