Beheadings in the Bible
2 Samuel 4:12. David commanded his young men, and they beheaded them, cut off their hands and feet, and hanged them by the pool in Hebron. But they took the head of Ishbosheth and buried it in the tomb of Abner in Hebron.
2 Samuel 4:7. For when they came into the house, he was lying on his bed in his bedroom; then they struck him and killed him, beheaded him and took his head, and were all night escaping through the plain.
1 Samuel 17:51. Therefore David ran and stood over the Philistine, took his sword and drew it out of its sheath and killed him, and cut off his head with it. And when the Philistines saw that their champion was dead, they fled.
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Cannibalism in the Bible
2 Kings 6:28. And the king said unto her, What aileth thee? And she answered, This woman said unto me, Give thy son, that
we may eat him to day, and we will eat my son to morrow.
29. So
we boiled my son, and did eat him, and I said unto her on the next day, Give thy son, that we may eat him: and she hath hid her son.
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The Christian bible is not so different from the Koran.