While on the surface such a charge seems incapable of standing up in court (fictional films present their own version of reality ALL THE TIME, you can't stop them just because audiences are guillble), a similar suit was actually successful last year, when documentary footage was ordered removed from The President's Last Bang (a satirical film about the assassination of South Korean president/dictator Park Chunghee), because of concerns that viewers would be "confused" about what was real. And on the subject of religiously-themed films, Martin Scorsese's The Last Temptation of Christ went unreleased for years in Korea and was eventually only seen in a few theaters, due entirely to "pressure from religious groups."
Yeah. So Sony, it might be a good idea to keep those lawyers around for a little while. You know, just in case.