They must only be counting persecution by other religions against Christianity. Right now what the Moslems are doing to each other far outnumbers what they are doing against any Christians, who are only a part of their Western target area anyway. And the Christians in our military are having a fine old time of it getting the ragheads... which wasn't counted either, I bet.
And they probably counted the fighting against our invasion as anti-Christian too, which of course they are trying to make it be but it was originally against the invader, whoever they were.