Well I will agree that the Qur'an says such, and your theistic doctrine is as such, but I know many Christians that take it as a part of their religious belief to spread the word of God to the unbeliever. Which IMHO means that they do not "respect" this other persons belief as valid or equal to their own.
And what is wrong with that?
If you believed that grass was green but another believed it was purple would you accept that believe as equal in validity to yours? Would you respect it?
No.
If you think you have the truth and believe others hold to something that is false you should not respect those false beliefs. To show respect for a belief you believe is false is an act of a liar. I know many atheists in here who have no respect for Christianity. Why because they believe it is lies and a deception. They mock it and spew forth hatred against it. So all this talk of respect is a load of garbage.
Now you can have no respect for another view but you can tolerate that person holding that view. Tolerance is putting up with something you disagree with it is not respecting something you disagree with. One does not need tolerance for something they respect.
We Christians believe that Jesus is the Messiah and the Only way to eternity with God and we are directed by Jesus to give each and every human being alive in this world the opportunity to accept this. The only way to do this is to spread the message of Jesus. We Christians know the other eternity for those who reject the Messiah Jesus is not good, so to fail to give the message of Jesus is in fact an act of hatred towards the person you withhold the Word of God from.
Now people can accept of they can reject the message, People can take whatever emotional position they like towards it from hilarity to outright physical hostility but as far as a true followers of the Messiah Jesus is concerned they are called upon to give it no matter what the emotional response they receive.
All Praise The Ancient Of Days