One of the pillars of the entire Torah is to run away from any form of service to any other God. It is a capital sin and extremely crucial to the observance of Torah. A Jew who violates this sin willingly is like he violated all of the Torah and he loses many of his halachic privileges as a Jew.
To Save Your Life
- It is forbidden to worship another religion even to save your life.
- It is permitted to hide in a Church or house of worship of another religion in order to save your life.
Owning Symbols of Other Religions
- Shulchan Aruch Y.D. 157:1
- Shulchan Aruch Y.D. 157:3