All the examples you mentioned are threats of the past. The crusades were to rid the Holy Land of Muslims. I'm not justifying them, but they are not the same as the present attack on our nation. The crusades where not largely carried out by fundamentalist Christians. Christianity, the religion of Jesus that is, is not a religion of the sword, is not a violent religion. I understand your point that many violent acts have been accomplished in the name of Christianity and under false teachings of the Bible. But the basic teachings of Christianity, that is, the basic teachings of Jesus Christ are in sharp contrast to the basic teachings of Mohammad and where rejected by Mohammad.
Jesus Christ never pulled a sword against any. His angry side was reserved for those who pretended to be of the same faith as He, but were actually misleading people out of His way. Only once did the Bible record him lifting a hand, and that was against the money changers in the Temple, the House of the Lord, which is same as someone defending his/her own home. In contrast to Mohammad, Jesus did not violently resist other religions, and He never broke a law in His life. In fact, Jesus laid down His life. He could have called the hosts of Heaven to save Him, but he chose not to.
The basic teachings of fundamentalist Islam are those of hatred, cruelty, and murder. Read the Koran and the Hadith, the two holy books of Islam to see what the Holy Prophet Muhammad said to do to those who do not convert.
I quote Jesus;
"Think not that I am come to send peace on earth:I came not to send peace, but a sword"
Matthew 10:34
Now you and I know that taken in context with the rest of Jesus' teachings, this is not a command for His followers to use the sword or to kill unbelievers in His name.
However, just as some people point to verses in the Koran to claim that Islam teaches violence, by the same token others can point to verses in the Bible to claim it teaches violence.
So again, my original point is that attempting to prove to others that Islam is evil and Christianity is good, this is a futile approach which is more likely to polarize people than to win converts.