I’ve read in one of your answers that entering a non-Jewish place of worship is forbidden, even for secular purposes. Does this also apply to firefighters / emergency response workers / nurses / doctors who may have to enter such a place for purposes of rescuing people / saving lives - in the course of their daily routines, in doing their jobs?

For the sake of saving lives you are allowed to enter. (Heard from Rav Ya'akov Ariel)