Islam, a growing threat to the free world?

[A Theist]

He's clearly not justifying anything, he's saying Christianity, as an identity, has no right to condemn religious violence and act like it hasn't done things that were just as bad.

It didn't sound that way to me. In all of his posts he condemned Christians for events that happened centuries ago. No where did he condemn the Islamic terrorrism our nations are enduring today. It "seemed" to me that he was dismissing it. He also said in another post that he knows christians would do the same if they weren't constrained. I say he doesn't know. I could just as easily argue, based on the content of his posts, that he would do the same if he weren't constrained...but how do we really know the private thoughts of another?
I didn't raise the Islamic terrorrist concern as a christian, but as a citizen who could potentially be one of many victims of a terrorrist attack within Europe and the United States.