This is a tricky question.
Let me say first off that the extream few cases of "possestion" that were not able to be explained by mental health doctors or normal doctors were all done on young children most under the age of 10.
To if they were possesed by a deamon of some sort?
Who is to say really I belive there are a great many things out there to which we will never be able to explain or even agree they are there.
But I dont belive demonic possesions have anything to do with the devil or christ for that matter.
I belive most are simply cases of personality disorders.
Though even I have to admit Im puzzeled by one that happened when I was a small child I would have to find the story again but it was about a little boy the church claimed was possesed I belive he was around 8 or 9.
But as for the question no..I dont think christians are any safer than anyone else.