Is working for a company that produces movies, songs, the Gospel, and Christian sermons—in addition to forcing people to listen to them and prohibiting prayer—considered unlawful (haram) or dubious (فيه شبهة)? And is it obligatory to leave this job?

The fundamental principle is that it is permissible for a Muslim to work for disbelievers. However, it becomes forbidden for him to work if he is assigned a task that involves something prohibited, such as producing CDs for Christian lessons and teachings that believe in the Trinity and deny monotheism, because this entails spreading disbelief and falsehood. Similarly, his work is forbidden if it involves spreading forbidden films and songs, as it falls under the general meaning of Allah's saying: "And do not cooperate in sin and aggression," and His saying: "Indeed, those who like that immorality should be spread among those who have believed will have a painful punishment." Therefore, a Muslim must immediately abandon this forbidden work and advise others to leave it.