3 Thou shalt have no other gods before me.
4 Thou shalt not make unto thee any graven image, or any likeness of any thing that is in heaven above, or that is in the earth beneath, or that is in the water under the earth.
5 Thou shalt not bow down thyself to them, nor serve them: for I the Lord thy God am a jealous God, visiting the iniquity of the fathers upon the children unto the third and fourth generation of them that hate me;
Per the above, no Christian should be a respecter of other religions - only a respecter of people to choose them. As a result, no Christian should respect Islam. They should love Muslims like the rest of their fellow man, but hate the religion – because of the commandment above, and because it is evil, as seen in the actions of the most ardent adherents of the religion, particularly Muhammad.
Until Americans get that there is no virtue in respecting Islam, and that it is an anathema to God, we will never see the solution to the problem in the Middle East - which is to displace Islam, and set the people in that region free from it. Trying to attain lasting peace in the Middle East with Islam in place is folly. It is like trying to nurse a patient to health, while he has a huge tumor in his stomach.