His title is Pope. Period. Whether you are Catholic, Jewish, Muslim..whatever.
MM
His title is Pope for you. It is bestowed upon him by a group, and they choose to refer to him as such. I, and many others, do not choose to do this. If it is any help to you, I shall always refer to Bela Pelosi as Pelosi (D; CA).
Of course he IS the Pope. There are some who just don't have the respect or courtesy to address him as such. I wonder if they would mind their pastors referred to as MR. So-in-so?