I think you have to be more specific with the term "xian". For example, my sister would probably call herself a xian, but, she has never read the bible, never been to church, unless its been a funeral, is about as unforgiving as a Tsunami, drinks, smokes, swears, has slept about a bit and probably couldn't differentiate between noah and moses. So, is that a xian?
The other type, the ones that pound their bible nightly, say their prayers before bedtime and would forgive the killer of their child should be avoided from all friendship or association, their existence is a blasphemy to Satan and the Gods of Elysium, in my opinion this type breath's in a lie and spreads it with each exhale, a true Pandemic Virus.