Prison Act Article 41

Inmates have the freedom to practice their religious beliefs which may not be limited or denied. However, the preceding provision does not apply if a religious activity adversely affects the order or security of the prison.A prison may, based on the request of an inmate, arrange suitable religious teacher to provide counseling activities to the inmates.A prison may invite religious figures to host religious activities beneficial to the inmates.Inmates are permitted to own objects or books related to their religious beliefs. However, items that adversely affect the order, security, or management of the prison may be limited or denied.
中文原文 監獄行刑法第41條
受刑人有信仰宗教之自由,不得限制或禁止之。
但宗教活動有妨害監獄秩序或安全者,不在此限。
監獄得依受刑人請求安排適當之宗教師,實施教誨。
監獄得邀請宗教人士舉行有助於受刑人之宗教活動。
受刑人得持有與其宗教信仰有關之物品或典籍。
但有妨害監獄秩序、安全及管理之情形,得限制或禁止之。

English translation for reference only; the Chinese text prevails. Not legal advice.