Either you are being naive, or you truly believe that Muslims are evil.
..that the Qur'an and the OT teach mankind to be evil.
It's hypocrisy. Many people praise democracy until it results in a system they are not in agreement with.
The western secular system has evolved into what we have today. Many Christians have become so liberal, that they follow next to nothing or have become atheists!
The Qur'an does NOT teach people to kill other people from peaceful nations. It teaches to deal harshly with enemies.
It's no different to how US and UK treated Hitler and his followers.
..so please .. don't take the Qur'an and OT out of context.
OK, I really want to bring down the temperature. First, I don't care what you believe, that is your personal decision. If that is the path that speaks to you and teaches you, then that is the appropriate path for you.
Having said that, keep in mind that you began by trying to discredit Christianity, and using misinformation (or misapplied information) to do so, without considering the context. The context renders the discredit moot, and so to justify the discredit the context is ignored. That is a very common rhetorical device.
Not all Muslims are evil, but the world has witnessed a great deal of evil in the past few decades done by evil Muslims. There is simply no other way to honestly put this.
That does not excuse evil done in the world by Christians, or Hindus, or Buddhists, or any other faith. Evil is evil regardless. Attempting to justify evil only implies agreement with it or collusion with it.
I look around at the various faith walks, who by and large share a good many moral teachings (I did an exercise not long after I started here, the thread may still exist somewhere, comparing the moral teachings of the major faiths), and most emphasize good works and cooperation. The only odd man out I see as a rule (not exception) is Islam. I mean no disrespect, just my honest observance, and that is completely divorced from any secular or patriotic sentiment.
So when someone attacks from a Muslim perspective, I am on guard. I know they tend to be well versed in rhetoric, but rhetoric has no obligation to truth. American politicians are fond of rhetoric for that very reason. Rhetoric has only to tug on heartstrings and sound plausible to gain believers. I am NOT saying Islam is rhetoric, but I have heard many Muslims using rhetorical tactics to advance their arguments, and then bounce back to logic in an effort to cover their trail. Quite clever actually, but not scholarly, and get really testy when called on it.
You are passionate for your belief, that is a good thing. I would only say that being zealous for your faith can easily tip over the edge into becoming a Zealot. Some faiths are more prone to this than others, but people are people and this is a psychological tendency of people. I can say this because I have stood on the brink and stared down into this particular abyss.
I would encourage you to practice looking past the shortcomings of those you disagree with. You do not have to accept, you do have to tolerate. If G-d is love, and love exhibits peace as but one manifested evidence, then in order to live in peace with others you have to learn to tolerate them. It can be difficult to discuss with those you disagree with, but the alternative is to jump headlong over the brink into the abyss.