blind men and elephant fish 맹인들과 코끼리 물고기: A question for Christians.

I have recently been screwed by a few people who strongly identify themselves as Christians and whom I believe are not doing so for the purposes of deception but truly believe themselves to be Christian. Is it fair for me be to be especially annoyed at them (i.e. hold them to a "higher" moral standard") or should I recognize that all humans beings are flawed, no matter what creed they profess? I want to hear the opinions of Christians as I already (probably) know how non-Christians would answer this.