Here's a few examples from the Bible on what I am referring to:
Exodus 31:15 - Six days may work be done; but in the seventh is the sabbath of rest, holy to the LORD: whosoever doeth any work in the sabbath day, he shall surely be put to death. - Instructions to kill tens of millions of Americans including you if you've ever been so foolish as to work on Sunday.
If your own full brother, or your son or daughter, or your beloved wife, or you intimate friend, entices you secretly to serve other gods, whom you and your fathers have not known, gods of any other nations, near at hand or far away, from one end of the earth to the other: do not yield to him or listen to him, nor look with pity upon him, to spare or shield him, but kill him. Your hand shall be the first raised to slay him; the rest of the people shall join in with you. You shall stone him to death, because he sought to lead you astray from the Lord, your God, who brought you out of the land of Egypt, that place of slavery. And all Israel, hearing of this, shall fear and never do such evil as this in your midst. (Deuteronomy 13:7-12)
Kill People Who Don't Listen to Priests
Anyone arrogant enough to reject the verdict of the judge or of the priest who represents the LORD your God must be put to death. Such evil must be purged from Israel. (Deuteronomy 17:12)
Kill Witches
You should not let a sorceress live. (Exodus 22:17)
Kill Homosexuals
"If a man lies with a male as with a women, both of them shall be put to death for their abominable deed; they have forfeited their lives." (Leviticus 20:13)
Kill Fortunetellers
A man or a woman who acts as a medium or fortuneteller shall be put to death by stoning; they have no one but themselves to blame for their death. (Leviticus 20:27)
Death for Hitting Dad
Whoever strikes his father or mother shall be put to death. (Exodus 21:15)
Death for Cursing Parents
1) If one curses his father or mother, his lamp will go out at the coming of darkness. (Proverbs 20:20 NAB)
2) All who curse their father or mother must be put to death. They are guilty of a capital offense. (Leviticus 20:9)
Death for Adultery
If a man commits adultery with another man's wife, both the man and the woman must be put to death. (Leviticus 20:10)
Death for Fornication
A priest's daughter who loses her honor by committing fornication and thereby dishonors her father also, shall be burned to death. (Leviticus 21:9)
Death to Followers of Other Religions
Whoever sacrifices to any god, except the Lord alone, shall be doomed. (Exodus 22:19)
Kill Nonbelievers
They entered into a covenant to seek the Lord, the God of their fathers, with all their heart and soul; and everyone who would not seek the Lord, the God of Israel, was to be put to death, whether small or great, whether man or woman. (2 Chronicles 15:12-13)
Kill False Prophets
If a man still prophesies, his parents, father and mother, shall say to him, "You shall not live, because you have spoken a lie in the name of the Lord." When he prophesies, his parents, father and mother, shall thrust him through. (Zechariah 13:3)
Kill the Entire Town if One Person Worships Another God
Suppose you hear in one of the towns the LORD your God is giving you that some worthless rabble among you have led their fellow citizens astray by encouraging them to worship foreign gods. In such cases, you must examine the facts carefully. If you find it is true and can prove that such a detestable act has occurred among you, you must attack that town and completely destroy all its inhabitants, as well as all the livestock. Then you must pile all the plunder in the middle of the street and burn it. Put the entire town to the torch as a burnt offering to the LORD your God. That town must remain a ruin forever; it may never be rebuilt. Keep none of the plunder that has been set apart for destruction. Then the LORD will turn from his fierce anger and be merciful to you. He will have compassion on you and make you a great nation, just as he solemnly promised your ancestors. "The LORD your God will be merciful only if you obey him and keep all the commands I am giving you today, doing what is pleasing to him." (Deuteronomy 13:13-19)
Kill Women Who Are Not Virgins On Their Wedding Night
But if this charge is true (that she wasn't a virgin on her wedding night), and evidence of the girls virginity is not found, they shall bring the girl to the entrance of her fathers house and there her townsman shall stone her to death, because she committed a crime against Israel by her unchasteness in her father's house. Thus shall you purge the evil from your midst. (Deuteronomy 22:20-21)
Kill Followers of Other Religions.
1)If your own full brother, or your son or daughter, or your beloved wife, or you intimate friend, entices you secretly to serve other gods, whom you and your fathers have not known, gods of any other nations, near at hand or far away, from one end of the earth to the other: do not yield to him or listen to him, nor look with pity upon him, to spare or shield him, but kill him. Your hand shall be the first raised to slay him; the rest of the people shall join in with you. You shall stone him to death, because he sought to lead you astray from the Lord, your God, who brought you out of the land of Egypt, that place of slavery. And all Israel, hearing of this, shall fear and never do such evil as this in your midst. (Deuteronomy 13:7-12)
Sorry for so many examples, it's just too easy. I could post dozens of more horrific biblical instructions, but there are thousands of sites you could visit with a quick Google search. The Torah is the Jewish holy book and is basically the Old Testament. The Qur'an has many awful passages (and esp. in the hadiths), again you can google them. 'Kill 'em All' wasn't a song, but the name of the 1983 album. I've looked through these lyrics and can't find instructions to kill anyone. I listen to a LOT of rap, and while some is full of violence, they are not telling ME to go do these things. But even if there is music giving negative instructions, it is not claiming to be the absolute perfect word of god. Very few will follow rappers' instructions to do violence to others, millions are likely to follow the absolute and perfect word of god (the bible's) instructions to do violence. I do not know how this can be stated any clearer...