Dear Hessian,
You've made several statements that I will address in succession.
Firstly, I'm not surprised that the same people who keep espousing the claim that 'islam is violent, barbaric, etc' are the same ones who can't make distinctions between a small category of individuals and groups and an entire religion whose adherents make up 1.2 billion people. With regards to the people carrying signs that said "Islam will dominate the world", they are from a fringe group called Hizb e Tehrir and Al Muhajiroun. The fact that you cite to this group as purportedly representing the majority of Muslims is a display of the profound ignorance you have the Muslim world. Hizb e Tehrir and Al Muhajiroun are banned all through out Muslim countries. They are not supported by Muslim governments anywhere in the world. That is why they exist in Western countries such as the Uk. To claim that the majority of Muslims represent these groups is just absurd. Theologically speaking, the overwhelming majority of the Muslim world doesn't adhere to the theology espoused by these groups. There are many Muslim scholars who have devoted their entire lives in refuting these groups.
Secondly, with regards to Israel, most Muslims all over the world have no problem with accepting Israel as a state. In fact, the Palestinian Prime Minister Mahmoud Abbas is calling exactly for this. He happens to be a Muslim. Its another group, HAMAS, which is calling for the extermination of Israel. Israel's neighbors have also recognized it. Lets not forget Jordan, Egypt, and Turkey, all of whom happen to be Muslim countries.
Thirdly, with regards to your slanderous claims against Muhammad (peace be upon him), I can raise similar claims from Biblical figures. The prophetic biography is more than enough proof against your absurd allegations, which will be exposed in due time, God willing.
Fourthly, your claim that Islam is a medieval religion that cannot adjust to modern life is also an ignorant claim. Within Islamic jurisprudence, through the legal mechanism of 'ijtehad' which is independent reasoning, the Muslim understanding of their theology is always kept up to date for new circumstances and a re-interpretation of old issues.
Fifthly, I'm glad you raised the question of Muslim contribution. I'll be more than happy to indulge you in a little bit of history that confirms that Islamic civilization's contribution to humanity has been more positive than negative. For starters, lets take a look at this page that gives a brief synopsis on Muslim Philosophers:
http://www.muslimphilosophy.com/#people
The Muslim contributions to civilization are well known, especially in the fields of mathematics (algebra), astronomy, sailing (astrolabe), geography, history, etc. The recent winner of the Nobel Peace Prize was a Muslim. The designer of the Sears Tower was a Muslim. I suggest you study Islam a little more before making such preposterous claims. You make yourself look uneducated.
Sixthly, your constant reference to Muslim anti-semitism is also misleading. If I recall, the Jewish Golden Age occurred in Muslim Spain. Muslim Spain was eliminated through the Inquisition which also targeted Jews in the name of "Christianity". Where did these Jews go? They didn't re-settle in other parts of anti-Semitic Europe, they re-settled within Muslim lands in the Ottoman Empire where many achieved high status and ranks within their government.
Seventy, I honestly could care less about most of your claims, but nothing is more absurd than your claim that Muslims worship Allah on blind faith. If you've read the Qu'ran and had one iota of intellect, you would realize that Islam is not built upon blind faith. In the Qu'ran, God question's humanity's belief system on blind faith. Islam rejects those who adopt religions based on the mere fact that their ancestors followed that religion or that it makes them feel good. There are countless verses in the Qur'an that enjoin mankind to use their intellect. In Islamic history, there have been countless theologians who have worked diligently to prove the existence of the Creator. There are hundreds of proofs available from classical Muslim theologians who worked closely with Christians and Jews in their pursuit of the supremacy of monothiesm.
If you want to see the Muslim influence on Christian and Jewish theology, I suggest you read "The Philosophy of the Kalam" By Professor Harry Wolfson which gives a detailed exposition of Muslim theology using philosophical methods:
http://www.muslimphilosophy.com/books/kalam.pdf
I find it interesting that you're telling me that its 'irrational' to believe in one God who asks humanity to believe in Him through proofs and not blind faith, yet you divide God into three parts which is logically absurd and yet claim that he's one and take it on blind faith. What's the proof for that? Is it rational or is it based on blind faith?
Lastly, your claim that Islam is inherently violent and barbaric has been met responded to repeatedly in this thread directly from Islamic textual sources such as the Qur'an and Hadeeth and also in the form of legal verdicts from scholars from all over the Muslim world. If you want to be a suspicious paranoid who rants and ignores the explicit facts, be my guest friend.
There are over 1.4 billion Muslims in the world and over 6 million in America. The overwhelming majority are peaceful people who want the same freedoms that everybody else does. Your stereotyping of 1/6th of the world is a reflection of your ignorance, not of Islam.
With Peace,
Abdulhaqq
Are you a politician? Did you say, oops, I made a mistake. No. We get, "that's why I incorrectly labeled it ..." like it was on purpose to serve a higher purpose. 
