My beliefs are my property, too, since they are proper to me. If someone asks me to give them up, shouldn't I fight for what's mine? If you have a belief, but can't act upon it, you're not free. Which is why people die for their beliefs.
Religious beliefs are not tangible, so I don't see any reason to die for them....you can always have them, and still stay alive. I think God will know what is in your heart, no matter what you may say.