Tony Blair doesn't just claim to be a Christian, he is one.  That he is perhaps not the best Christian is my point:  He is still a Christian, but maybe not a good one.  Bush similarly.  There are countless Christians of whom many Christians such as yourself might not be proud, but they are Christians nonetheless.  That Aziz identifies himself as a Christian makes him one.  You are very probably right to believe he is not a good one.  And, of course, I too would be embarassed by him were I a Christian.   

Wikipedia is not a Christian project (by which I mean to say nothing bad about Wikipedia).  Articles cannot be judged purely from a Christian perspective.  And certainly not only from one Christian's POV.  What now?  We seem to disagree.  I have sought others' opinions here.