You can find almost diametrically opposing statements in the Quran. Little things, such as that all peoples of "the book" are to be accorded respect. This means that they are not to be treated poorly, they are NOT to be forcibly converted and they are NOT to be murdered. To do so is to put oneself outside of the rules of the Quran, and makes one an apostate. According to the Quran, all Apostates are to be killed, so this literally means that any Muslim that kills a Christian or a Jew is to be killed as an Apostate.
Yet, other passages state that any non-believer is to be put to the sword. What is a non-believer? Once again, according to some passages, all peoples of the Book are believers. Yet, in other passages, Christians and Jews are non-believers.
So, what is any person to do? If they follow one set of passages, they are in violation of the other. This literally makes no sense at all.