The statement in the title of the thread is true. Islam is indeed inherently violent. However, if you've read the Bible, you should know that the Bible is overflowing with violence, plenty of it ordered by god. So obviously, Christianity is inherently violent as well.
Today, the majority of Christians and Muslims are obviously not violent. That's easy to see, since 51% of the people you see around you don't go around hitting other people, or killing other people on a daily basis, or wishing to kill people on a daily basis. (I would add though that the Christians in favor of war are indeed proviolence, but I think that's much less than 51% of Christians, and I think the proviolence of these people isn't related to religion.)
Anyway, Christians will eternally have trouble criticising Muslims as being violent. Any Christian who says, "Hey, look at the Koran! It's got violence in it!" will have to then defend the Bible. The Bible is loaded with violence, so anyone can say, "Hey, did you notice what the Bible says?" (I'm ignoring the fact that this is a bad argument tactic. That's a different subject.)
The good thing about these holy books is that people don't truly follow them. Isn't that nice? All this talk about the Koran and the Bible being good guides for morality is completely useless! They're both incredibly poor guides for morality. Generally what people do is only follow parts of either book, and reject the rest. Because people do that, that clearly and obviously shows that those books are just not good guides for morality.
One other thing. I'd like to show examples of people who are proviolence due to religion and people who are proviolence not due to religion.
Proviolence due to religion: Osama bin Laden, Becky Fischer (female camp manager in Jesus Camp)
Proviolence not due to religion: Saddam Hussein, Bill Kristol
Becky Fischer is proviolence due to her desire to turn Christian children into soldiers. She actually admires the violence and fervor that Palestinians teach their children.