"The organisation said it had written to Sony Pictures executives in Japan to ask the studio to emphasise that the film was a work of fantasy."
Opus Dei are probably trying to prevent any conflict with their own ficticious works of fantasy, saints, relics, dogmas, etc. The poor folks will recognise the movie as competing for the minds of the gullible who follow them. Why else would Opus Dei make a request such as this on a work of fiction.?