yes of course christian women can do it .. in Egypt alot of christian fast with Muslims in Ramadan month .

hello dear, yes they CAN <-- if they want to, but they wont be forced to wear it by government authorities

in fact Christian women wear a Hijab before muslim and before islam coming so i dont see any problem if Eastern Christian women wear a hijab and its symbol to avoid u from people has bad eyes . right now people wear a hijab as style not as symbol of religion and thats not good its my opinion

Hello! Common sense tells me that only Muslim women wear hijabs. There is an item on the Wikipedia though, which you can read and find out the answer. http://en.wikipedia.org/wiki/Hijab#Women