Christians believe that Jesus showed examples of absolutely detesting sin. He loved his Old Testament. His core doctrine was that the Law has no errors in moral or religious matters. It commands and advises hate of sin. Jesus staked his own doctrine on the Old Testament which means that if he contradicts it then he agrees with us letting it have the final say.
The Bible is clear that the reason we must hate sins is because we must hate sinners. To do one is to do the other. Sinners are hateful just because they are. God is not commanding us to hate them so much as telling us we can do nothing else. Jesus told us to love our enemies but he did not say they were necessarily sinners in being our enemy. Perhaps we are the problem.
Jesus said we must not judge the motives and how responsible the other person is. He does however say we must judge their actions. Is such a teaching useful? For one thing, people can be roused to change for the better if they are confronted with how bad they are in character. Jail does not stop you being bad – only being helped to see you are a bad character does that. The believer observes that Jesus is not telling us to not want to judge the motives of the other - it is just that we cannot see into the person to do it. It is about what is practical. Christians say that evil behaves remarkably like it has a mind of its own which is why Jesus called it a slavemaster and Paul writes about it as if it were a person in Romans 9.
Christianity is only a body of opinion not a religion if it has no way of determining what its standard doctrine is and if it cannot demand that standard be taken seriously.
It solves this by saying it cannot contradict the Bible for the Bible is the teaching of God. Jesus is the centre of its Bible and it says he came because he hated sin and to save sinners from it.
Let us quote the Heidelberg Catechism which takes its stance from the Bible,

Q. 113. What doth the tenth commandment require of us?

A. That even the smallest inclination or thought contrary to any of God’s commandments never rise in our hearts; but that at all times we hate all sin with our
whole heart, and delight in all righteousness.
The law of God says God hates.
Lev. 20:23, "Moreover, you shall not follow the customs of the nation which I shall drive out before you, for they did all these things, and therefore I have abhorred them."
The Proverbs given to grant popular and easy guidance to the people say God does not love sinners.
Prov. 6:16-19, "There are six things which the Lord hates, yes, seven which are an abomination to Him: 17 Haughty eyes, a lying tongue, and hands that shed innocent blood, 18 A heart that devises wicked plans, feet that run rapidly to evil, 19 A false witness who utters lies, and one who spreads strife among brothers." Proverbs 8:13 - The fear of the Lord is to hate evil; pride and arrogance and the evil way and the perverse mouth I hate.
Proverbs 15:9 - The way of the wicked is an abomination to the Lord, but He loves him who follows righteousness.
The prophet says God hates.
Hosea 9:15, "All their evil is at Gilgal; indeed, I came to hate them there! Because of the wickedness of their deeds I will drive them out of My house! I will love them no more; All their princes are rebels."

The psalms themselves used in public and synagogue worship command hate.
Psalm 5:5, "The boastful shall not stand before Thine eyes; Thou dost hate all who do iniquity,"

Psalm 11:5, "The Lord tests the righteous and the wicked, and the one who loves violence His soul hates."
Psalms 36:1,4 - One reason God condemns evil people is that they do not abhor evil. Not only does God Himself hate evil, he expects us to do the same. If we do not hate evil, then He considers us to be evil.
Psalms 97:10 - You who love the Lord, hate evil!
Psalms 119:104 - Through Your precepts I get understanding; therefore I hate every false way.
Psalms 119:127,128 - I love Your commandments more than gold, yes, than fine gold! Therefore all Your precepts concerning all things I consider to be right; I hate every false way.
The hate is not a law written in some dusty old book. Steps were taken to make sure the hate would be promoted as much as possible especially through public worship.
If Jesus was against hate his voice is drowned in the middle of all that.
And if he was so against it why did he go to worship regularly in the Temple and synagogue? Why did he train as a Rabbi?
Why does Christianity tell us to hate sin?

Jesus said that we must prefer to have an eye gouged out than to use it to sin.

We sense that he was advocating the attitude, "Hypothetically, if I had to saw off a body part to avoid sin, I would."  It is using self-hatred in a pious way.  It is disturbing how he would have known the divine command to cut off a woman's hand should she assault a man by grabbing his privates.  It makes this hate for the body seem so real. 

 He reaffirmed the fanatical moral teaching of the Old Testament. By implication he sanctioned Ezekiel through whom God said that if you don't admonish the sinner you will be held responsible for the punishment he gets.

Not surprisingly the New Testament preaches hate too.
Romans 12:9 - Hate evil, love good. Abhor what is evil. Cling to what is good.
Hebrews 1:9 - Jesus loved righteousness and hated lawlessness; therefore God blessed and honored Him.
Revelation 2:6 has Jesus declaring that he hates the deeds of the Nicolaitans so Jesus hates sin.

Jesus nearly died of a stroke when he castigated the hypocrisy of the Jewish leaders. He called them murderers in Matthew 23 and told them to finish him off.  This amounts to inciting violence against them.  And he knew the attacks were going to be directed at their wives and children, the easy targets, first.  What if people decided to kill them to save Jesus?  Jesus did not care.

He told unbelievers that he did not know how he could endure them and their sin of unbelief any longer. He dreaded the cup of torment that awaited him when he was in the garden preparing for his crucifixion so if he hated that evil imagine how much he hated people doing harm!

On the cross he asked God why he felt so abandoned. The Christian answer is that he felt what sin is like and how vile it is and how it cuts God out. The hatred of the cup and the loneliness on the cross is supposed to reflect Bible teaching that Jesus had to in a sense become sin on the cross and he couldn't bear it for he hated sin so much. If Jesus hated sin so intensely as if he were a sinner when we were not that shows how much we are to hate sin. The implication is that if we sin we are not only hurting ourselves and another person but we are attacking Jesus in a totally reprehensible way.

Despite drippy religious liars, Jesus did agree with his God who ordered genocide in the Old Testament. The classic defence is that though that was evil, God was literally forced because the nations that had to be liquidated were so bad and irreformable. Babies and children died in those genocides. So the implication is that the evil people were to blame for the death of their own innocent babies. With all that, it is impossible to believe that Christianity really can love anybody! The love in the Christian comes from herself or herself not the religion.

History is replete with moralists like Jesus who were too accepting of depraved hate.  Their evil moralisms afflict us today.

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