There are Five Pillars to Islam[1]. None of which explicitly call for genocide. The early history of Islam was violent. But so too was the early history of Christianity. The past was extraordinarily violent. That there are some people who profess to be advancing Islam by killing in no way makes it an essential part of Islam. In the same way, the people who profess to be advancing Christianity and choose to do so by killing too[2] hardly makes it an essential part of Christianity. Islam has Sharia law. Christianity has Leviticus. Christians are still debating how much crazy stuff from Leviticus they can foist into a modern society and I have no doubt Muslims try to do the same with Sharia.
[1] http://en.wikipedia.org/wiki/Five_Pillars_of_Islam [2] http://en.wikipedia.org/wiki/Christian_terrorism