The immorality of the Bible God
The Bible, especially the Old Testament, features a god whose immorality is beyond imagination. Bloodthirsty, he kills for the most perverse reasons (over 200000 times more than the devil if we count in the Bible). He orders genocides of whole populations whose "crime" was to have another religion, he requires to stone members of "his people" who practice another faith, to kill homosexuals, to stone women who don't bleed during the wedding night (which is not even a proof that they were no virgins...), to kill adulterers, to kill "witches", to stone people who do even an insignificant work on Sabbath day... However, it is possible to change his mind by convincing him that his reputation will suffer, or by offering him an animal sacrifice whose smoke inhalation will appease him. In the New Testament, we are then told that all humans are condemned to suffer for eternity by default, and that there is only one way to avoid this horror: to believe in "the true religion" (but not in another one!) when we die. If you believe that Jesus, the son of God, died on the cross for your sins and that he raised from the dead, you will win an eternity of happiness with God, but if you don't believe it, you will be unhappy for ever, whatever you have done during your life. This is again no love. Of course, the Bible contains also beautiful passages and passages which seem to be beautiful (like the Koran). Its authors are not equal. But the global impression, the background, are extremely negative. The Bible god is the antithesis of natural morality (if you wonder how morality can exist without a divine definition, please read chapters 6 and 7 from "The God Delusion" by Richard Dawkins about the origin of morality and page 62 of this book about problems which appear if we pretend that "God" is the source of morality).
I recommend you the book God: The Most Unpleasant Character in All Fiction by ex evangelical pastor now atheist Dan Barker. On the same topic, I recommend you also the list of God's killings in the Bible. Click on an event if you want to know more about it. This report is absolutely overwhelming. If a supernatural spirit were indeed responsible for the Bible, we could ask ourselves very serious questions about the nature of this spirit.
Here, I will only mention the stoning of women who don't bleed during their wedding night, what the Bible says about homosexuals, the death penalty for Israelites who have chosen another religion than "the only true one" (an important asserted characteristic of the Bible god is that he were jealous), the order to exterminate whole populations in the Old Testament, the racism in the Old Testament, the human sacrifices prescribed in the Old Testament, the problems caused by the obligation to believe a particular dogma in order to escape supposed eternal suffering after death, and the intolerance toward people with other beliefs in the New Testament.
The order to stone women who don't bleed during their wedding night (honor killing)
If any man take a wife, and go in unto her, and hate her, And give occasions of speech against her, and bring up an evil name upon her, and say, I took this woman, and when I came to her, I found her not a maid: Then shall the father of the damsel, and her mother, take and bring forth the tokens of the damsel's virginity unto the elders of the city in the gate: And the damsel's father shall say unto the elders, I gave my daughter unto this man to wife, and he hateth her; And, lo, he hath given occasions of speech against her, saying, I found not thy daughter a maid; and yet these are the tokens of my daughter's virginity. And they shall spread the cloth before the elders of the city. And the elders of that city shall take that man and chastise him; And they shall amerce him in an hundred shekels of silver, and give them unto the father of the damsel, because he hath brought up an evil name upon a virgin of Israel: and she shall be his wife; he may not put her away all his days. But if this thing be true, and the tokens of virginity be not found for the damsel: Then they shall bring out the damsel to the door of her father's house, and the men of her city shall stone her with stones that she die: because she hath wrought folly in Israel, to play the whore in her father's house: so shalt thou put evil away from among you.
Note: for this passage, it is not possible to use the traditional argument "at that time, the context was different, it was good for that time but not for today." Indeed, some women don't bleed during their first sexual intercourse, so the impossibility to show "the tokens of virginity" is not a proof that a woman was no virgin before her wedding. There is, by the way, a logical mistake. In this passage from the Bible, the bride party has to prove her innocence, the bride is considered to be guilty by default. Fortunately, the contrary is valid in modern justice. The defendant is considered to be innocent as long as his guilt has not been proven (in order to avoid plenty wrongful condemnations).
The Bible and homosexuality
I wrote a separate article to this issue, see "the Bible and homosexuality".
Death penalty for Israelites who have chosen another religion than "the only true one"
If there be found among you, within any of thy gates which the Lord thy God giveth thee, man or woman, that hath wrought wickedness in the sight of the Lord thy God, in transgressing his covenant, And hath gone and served other gods, and worshipped them, either the sun, or moon, or any of the host of heaven, which I have not commanded; And it be told thee, and thou hast heard of it, and enquired diligently, and, behold, it be true, and the thing certain, that such abomination is wrought in Israel: Then shalt thou bring forth that man or that woman, which have committed that wicked thing, unto thy gates, even that man or that woman, and shalt stone them with stones, till they die. At the mouth of two witnesses, or three witnesses, shall he that is worthy of death be put to death; but at the mouth of one witness he shall not be put to death. The hands of the witnesses shall be first upon him to put him to death, and afterward the hands of all the people. So thou shalt put the evil away from among you.
Order to exterminate whole populations in the Old Testament
When thou goest out to battle against thine enemies, and seest horses, and chariots, and a people more than thou, be not afraid of them: for the Lord thy God is with thee, which brought thee up out of the land of Egypt. And it shall be, when ye are come nigh unto the battle, that the priest shall approach and speak unto the people, And shall say unto them, Hear, O Israel, ye approach this day unto battle against your enemies: let not your hearts faint, fear not, and do not tremble, neither be ye terrified because of them; For the Lord your God is he that goeth with you, to fight for you against your enemies, to save you. And the officers shall speak unto the people, saying, What man is there that hath built a new house, and hath not dedicated it? let him go and return unto his house, lest he die in the battle, and another man dedicate it. And what man is he that hath planted a vineyard, and hath not yet eaten of it? let him go and return unto his house, lest he die in the battle, and another man eat of it. And what man is there that hath betrothed a wife, and hath not taken her? let him go and return unto his house, lest he die in the battle, and another man take her. And the officers shall speak further unto the people, and they shall say, What man is there that is fearful and fainthearted? let him go and return unto his house, lest his brethren's heart faint as well as his heart. And it shall be, when the officers have made an end of speaking unto the people that they shall make captains of the armies to lead the people. When thou comest nigh unto a city to fight against it, then proclaim peace unto it. And it shall be, if it make thee answer of peace, and open unto thee, then it shall be, that all the people that is found therein shall be tributaries unto thee, and they shall serve thee. And if it will make no peace with thee, but will make war against thee, then thou shalt besiege it: And when the Lord thy God hath delivered it into thine hands, thou shalt smite every male thereof with the edge of the sword: But the women, and the little ones, and the cattle, and all that is in the city, even all the spoil thereof, shalt thou take unto thyself; and thou shalt eat the spoil of thine enemies, which the Lord thy God hath given thee. Thus shalt thou do unto all the cities which are very far off from thee, which are not of the cities of these nations. But of the cities of these people, which the Lord thy God doth give thee for an inheritance, thou shalt save alive nothing that breatheth: But thou shalt utterly destroy them; namely, the Hittites, and the Amorites, the Canaanites, and the Perizzites, the Hivites, and the Jebusites; as the Lord thy God hath commanded thee: That they teach you not to do after all their abominations, which they have done unto their gods; so should ye sin against the Lord your God. When thou shalt besiege a city a long time, in making war against it to take it, thou shalt not destroy the trees thereof by forcing an axe against them: for thou mayest eat of them, and thou shalt not cut them down (for the tree of the field is man's life) to employ them in the siege: Only the trees which thou knowest that they be not trees for meat, thou shalt destroy and cut them down; and thou shalt build bulwarks against the city that maketh war with thee, until it be subdued.
The racism of the Old Testament
I wrote a separate article to this issue, see The racism of the Old Testament.
Human sacrifices prescribed in the Old Testament
I wrote a separate article to this issue, see Human sacrifices prescribed in the Old Testament.
The obligation to believe a particular dogma in order to escape supposed eternal suffering after death
I wrote a separate article to this issue, see The perverse consequences of the dogma "faith is an obligation in order to escape hell".
Intolerance of the New Testament toward people with other beliefs
2 Corinthians 6:14-16
Be ye not unequally yoked together with unbelievers: for what fellowship hath righteousness with unrighteousness? and what communion hath light with darkness? And what concord hath Christ with Belial? or what part hath he that believeth with an infidel? And what agreement hath the temple of God with idols? for ye are the temple of the living God; as God hath said, I will dwell in them, and walk in them; and I will be their God, and they shall be my people. Wherefore come out from among them, and be ye separate, saith the Lord, and touch not the unclean thing; and I will receive you. And will be a Father unto you, and ye shall be my sons and daughters, saith the Lord Almighty.
Unto the pure all things are pure: but unto them that are defiled and unbelieving is nothing pure; but even their mind and conscience is defiled.