O bahi, stop reading crap, these are not Mercedes or Audis...
No one steals them with such high tech, anyway if you still have doubts, wrap your FOB in Allumunium Foil and it won't transmit signals beyond that.
Further, modren car FOBs dont transmit beyound 3 feet range, is highly unlikely that you go that close to a thief to copy your signals...
One Tip, being a practicing Muslim, Recite Ayat Ul Kursi with safety and security of your family and belongings in your heart and Allah will Inshallah protect you. Further buy a good physical lock for your hearts content, there are very good gear locks, steering locks around