In my life to date, be it in working for, with or knowing as occasional aquaintance, people claiming themselves to be Christian, they just never live up to their Exterior holier than thou rant.
Most of these types can be borderline fanatical when discusion erupts with them about religion, but then, you see they never live up to their own preachings really.
I don't generalize my findings. It's been my factual personal experience with them. I can not take one seriously at face value.