All Christians use the same book, yet how they interpret it and the way they practice can be quite different.
Is there anything in the Bible which encourages Christians to kill, enslave or tax those who don't convert to Christianity? There is nothing that can be reasonably interpreted to mean this. The Koran outright states it in verses that one has to labor to interpret otherwise and frequently cannot be interpreted otherwise.
"Nuconvert". Does that mean you have converted to Islam? 
There is nothing in that book that exhorts people living since 500 BC to kill and slaughter. The Koran has a number of such commands that point to the present and future untill all the world is Islamic or dead, or at least dhimmi. The apparent nastiness in the Bible pointed to by critics was time, place, and enemy specific and was not extended to any other peoples that have lived since. The Crusades were not religious wars to convert anyone but were defensive actions to keep the Holy land open to pilgrims. There is no comparison between Islam and religion.