In Judges 12, the Gileadites find a way to distinguish between friend and foe by compelling captured refugees to say the word ‘Shibboleth.’ Evidently, Ephraimites couldn’t pronounce it correctly, saying instead ‘Sibboleth.’ Those that said that latter were struck down while those who said the former were allowed to pass.
‘Shibboleths’ abound in society, including among Christians. Unfortunately, even among Christians, a Shibboleth isn’t simply a quick way to distinguish where a person stands in relation to you but is used in a manner akin to the Gileadite’s use, thankfully, of course, without the resulting slaughter.
In other words, Christianese is a Shibboleth in the ears of the nonBeliever. The moment you begin engaging in Christianese you are at risk of being dismissed or marginalized in the eyes of the person you are talking to.
The Internet is filled with skeptics and scoffers poking fun at various aspects of Christianity as though they were the substance of Christianity when in fact they are slogans and phrases that are more part and parcel of Christianese- how the things are communicated- rather than the actual substance of Christianity.
Here I will give you a concrete example: http://www.godisimaginary.com/