Why does your God demand human sacrifice?

Question

Genesis 22:2
And he said, Take now thy son, thine only son Isaac, whom thou lovest, and get thee into the land of Moriah; and offer him there for a burnt offering upon one of the mountains which I will tell thee of.

Exodus 22:29
Thou shalt not delay to offer the first of thy ripe fruits, and of thy liquors: the firstborn of thy sons shalt thou give unto me.

Leviticus 27:28-29
No devoted thing, that a man shall devote unto the LORD of all that he hath, both of man and beast ... shall be sold or redeemed: every devoted thing is most holy unto the LORD. None devoted, which shall be devoted of men, shall be redeemed; but shall surely be put to death.

Numbers 31:25-29
And the LORD spake unto Moses, saying, Take the sum of the prey that was taken, both of man and of beast, thou, and Eleazar the priest, and the chief fathers of the congregation: And divide the prey into two parts; between them that took the war upon them, who went out to battle, and between all the congregation: And levy a tribute unto the Lord of the men of war which went out to battle: one soul of five hundred, both of the persons, and of the beeves, and of the asses, and of the sheep: Take it of their half, and give it unto Eleazar the priest, for an heave offering of the LORD.

Judges 11:29-40
Then the Spirit of the LORD came upon Jephthah.... And Jephthah vowed a vow unto the LORD, and said, If thou shalt without fail deliver the children of Ammon into mine hands, Then it shall be, that whatsoever cometh forth of the doors of my house to meet me, when I return in peace from the children of Ammon, shall surely be the LORD's, and I will offer it up for a burnt offering. So Jephthah passed over unto the children of Ammon to fight against them; and the LORD delivered them into his hands.... And Jephthah came to Mizpeh unto his house, and, behold, his daughter came out to meet him with timbrels and with dances: and she was his only child.... And it came to pass, when he saw her, that he rent his clothes, and said, Alas, my daughter! thou hast brought me very low, and thou art one of them that trouble me: for I have opened my mouth unto the LORD, and I cannot go back. And she said unto him, My father, if thou hast opened thy mouth unto the LORD, do to me according to that which hath proceeded out of thy mouth.... And it came to pass at the end of two months, that she returned unto her father, who did with her according to his vow which he had vowed.

2 Samuel 21:1, 8-9, 14
Then there was a famine in the days of David three years, year after year; and David enquired of the LORD. And the LORD answered, It is for Saul, and for his bloody house, because he slew the Gibeonites.... The king took the two sons of Rizpah the daughter of Aiah, whom she bare unto Saul, Armoni and Mephibosheth; and the five sons of Michal the daughter of Saul ... And he delivered them into the hands of the Gibeonites, and they hanged them in the hill before the LORD....And after that God was intreated for the land.

1 Kings 13:2
And he cried against the altar in the word of the LORD, and said, O altar, altar, thus saith the LORD; Behold, a child shall be born unto the house of David, Josiah by name; and upon thee shall he offer the priests of the high places that burn incense upon thee, and men's bones shall be burnt upon thee.

2 Kings 23:20
And he slew all the priests of the high places that were there upon the altars, and burned men's bones upon them.

Answer 1

Because the Bible was written by men. Many serial killers in the past were "ordered by God" to kill. Remember, the Son of Sam spoke to God who took the form of his neighbors dog, and told him to kill.

The problem is, today we see those people as crazy. In the past, for some reason we saw their writing as holy and divine.

Answer 2

If one believed that a blood sacrifice was necessary before God would forgive you, then even one example where God forgave without a blood sacrifice would prove that this idea is UnBiblical. There are many such examples, but the most interesting is found in the Book of Leviticus. The reason this is so interesting is that it comes right in the middle of the discussion of sin sacrifices, which is found in the first chapters. In Leviticus 5:11-13, it states, "If, however, he cannot afford two doves or two young pigeons, he is to bring as an offering for his sin a tenth of an ephah of fine flour for a sin offering." One can also see that one does not need a blood sacrifice for the forgiveness of sins in the Book of Jonah 3:10. There, the Bible simply states that God saw the works of the people of Ninevah. Specifically it says that the works God saw were that they stopped doing evil, and so God forgave them. There are plenty of other examples, and the idea that one needs a blood sacrifice for the forgiveness of sins is UnBiblical.