Fair's fair: It isn't as if Islam has a monopoly on that kind of belief:
Mind you, these are from the New Testament. The Old Testament is filled to the brim with much worse things.
Matthew 10:21
And the brother shall deliver up the brother to death, and the father the child: and the children shall rise up against their parents, and cause them to be put to death.
Matthew 10:35-36
For I am come to set a man at variance against his father, and the daughter against her mother, and the daughter in law against her mother in law.
And a man's foes shall be they of his own household.
Matthew 11:21-24
Woe unto thee, Chorazin! woe unto thee, Bethsaida! for if the mighty works, which were done in you, had been done in Tyre and Sidon, they would have repented long ago in sackcloth and ashes.
But I say unto you, It shall be more tolerable for Tyre and Sidon at the day of judgment, than for you.
And thou, Capernaum, which art exalted unto heaven, shalt be brought down to hell: for if the mighty works, which have been done in thee, had been done in Sodom, it would have remained until this day.
But I say unto you, That it shall be more tolerable for the land of Sodom in the day of judgment, than for thee.
2 John 1:9-11
9Whosoever transgresseth, and abideth not in the doctrine of Christ, hath not God. He that abideth in the doctrine of Christ, he hath both the Father and the Son.
If there come any unto you, and bring not this doctrine, receive him not into your house, neither bid him God speed:
For he that biddeth him God speed is partaker of his evil deeds.
Mind you, these are from the New Testament. The Old Testament is filled to the brim with much worse things.