It's not what you posited, though. You said you didn't know of a single Christian who was told to marry exclusively in their faith. I do. While a modern American (or even "Western") Christian might not be inspired to kill because of it, the sentiment definitely still exists---at least in my neck of the woods.
"It's not what you posited, though. "
Granted. Sometimes I lack the precision I'd like to have here. In a flowing conversation, these points are more readily clarified.