Is it permissible to cook and bake for a church function?

Answer

No, you may not do so. It is to aid sin and transgression. You will be aiding an institution of kufr and shirk. Cooking/baking specifically for a church is not permissible. It is I'aanat alal Ma'siyat (aiding sin) which is haraam by explicit Qur'aanic Nass. The technicality which some muftis quote to bolster their permissibility fatwas is baseless and may not be presented in abrogation of the Qur'aanic express prohibition. Taqleed of juziyaat (detailed masaa-il) which are palpably in conflict with Nass is not permissible.