People often quote the phrase convert or die from the Quran. Many books, texts, religions, and philosophies include interpretations that people interpret or take literally to point out those ideas or beliefs are bad, strange, wrong, or just a cult. Others use these concepts to belittle those who are different, justify behavior, take away rights of others and give privileges to themselves, treat them as property, or even kill.
There are many references in the New Testament where it is said that you must repent and believe or die. Text like that can just as easily be taken out of context. There are many parts of the New Testament that are glossed over because people choose to not take them literally. Then of course there is the Old Testament. Many people argue that the New Testament does not totally replace the Old.
The point here is that religion can be used to make us better people, or used to motivate people to do horrible things in the name of God. Do you think God orders people to kill sinners? Do you think people who kill prostitutes, blow up abortion clinics, or beat up homosexuals are doing so in God's name or out of hate and fear. It is that hate and fear that we need to avoid, not each other and those who are different.