The reason behind this is most christians have not read the bible. I have read it several times. Bring up the old testament, and they tell you the new testament is the "real" one. Even though the old testament has its roots close with islam, which is very similar. The New testament aside from starting with Jesus rejecting all that were not jews see matthew 12:22 and ending with him being the benevolent leader of all men. Matthew 12:22 was a very special passage for me, because it was when I had enough of the bullshit in the book.
Christians in general are often extremely ignorant of their own religion. Most do not recognize the book of matthew when i discuss it with them. I have never seen another group of people send their dumbest to try to recruit, but i guess we know what their market is. It isn't very good for them to have people that ask the hard questions they have no answers for.
Christians also seem to have a deep hate for muslims, and muslims christians, but the funny part is the ignorance that christians portray of the muslim religion. The new testament was torn through by catholics to give the image that showed it in a favorable light to serve their purposes and many gospels were left out that were very contradictory with what made it in or got adjusted in. The muslims also believe in jesus, just that his was not the final gospel, similar to the jews belief. Muslims and christians fight over the same holy land. It is ridiculous.
Now we know that Mista guitah keeps the Lord's counsel, so he knows the truth.
one funny thing is they did a study by religion and sector and measured their IQ's. Atheists were the highest (no surprise here), as you went down from taoism and other more philosphies down to babtist, the drop was dramatic, but the more fringe and cult like, such as mormon you got, it got pretty low.