text: "Has "Christian" now become used as a term of ethnic identity, where if one is white and of European roots, one is deemed to be a Christian, whether or not one is an actual believer, or an atheist?"
  
  Of course it has and why not.? People are identified by those who perceive themselves in the majority as such if they are Muslim, Catholic, Hindu, Irish, Italian, Chinese, etc. They've all been used to label individuals as a group to be hated.   Of course, history is filled with "Christian terrorists" (i.e. IRA, The Inquisition), but then the writers of history have also been generally Christian and thus, the lack of a cultural bent to so identify those who are essentially Christian Taliban. 
  
  ""The leader of genius must have the ability to make different opponents appear as if they belonged to one category."
  A. Hitler