Why?
Given God's penchant for murder, rape, torture, and slavery, I'm fine having a slightly different "understanding of right and wrong" from that "perfect" one.
There is no justice for those who do not get justice in this life, unless there is a day of justice for all. I cannot believe for instance terrorists who blow themselves up, in the name of religion, will get away with their radical and twisted acts.
God doesn't condone murder, rape, torture and slavery. The Old Testament has a lot of violence, a lot of it is accounts of what people did and God trying to work with people to lead them to a better path.
Murder: The 10 commandments are a broad outline of general morality of which is stated 'do not commit murder' (Exodus 20:13). When God commanded Joshua to kill the Canaanites, there are several key factors to consider:
1. It was God's command. If he gives life he has authority to take it if he sees fit.
2. It was for justice. The Canaanites were corrupt and wicked, even practising child sacrifice.
3. This was to protect the Israelites from falling into the same evil and corruption as a society.
4. The means of humans to kill them, not murder, was unique to the context of the ancient world. It was common and not the first thing God confronted with his people. They had enough trouble listening to God's commands through Moses as it was.
5. There is a progression in the Bible of God gradually confronting violence as a means to bring justice / judgement. It in no way makes sense in our 21st Century context and is in no way condoned by Jesus. Most of the time God brought judgement by his own means, and is strongly against the killing of the innocent even in the Old Testament. e.g. Jeremiah 19:4.
6. There is an argument that Joshua was only commanded to kill combatants. Either way the Bible does not condone murder. Violence as a means of justice was squeezed out of the ancient Israelites over time, to such the point where Jesus said to love ones enemies (Matthew 4:43-44).
7. Jesus didn't just refute murder, but the anger and hatred where murder comes from (Matthew 5:21-22).
Rape: People often bring up Deuteronomy 22:22-27 about this, but it is clear in the context that the woman is not guilty, only if she consents. There are stories of rape in the Bible but they are nowhere condoned. And just because some in the church rape young girls or boys, it doesn't mean it is condoned in Christian doctrine.
Torture: This is not condoned at all, again just because there are stories of these things happening it doesn't mean it was accepted. Again the teaching of Jesus is paramount to shape how we understand the nature of God and Christian morality. Love your enemies and turning the other cheek goes, beyond basically every other cultural understanding of right and wrong, and points to a higher moral standpoint. The way Christians are to confront evil is by showing a better way and to challenge it in society, respectfully, not with violence.
Slavery: It is true that the Old Testament accepts slavery and this is similarly in the New Testament. However there are some key factors in what this actually means:
1. Slaves were a common part of ancient culture. The Israelites were to treat slaves with honour and respect in contrast to rights in many other cultures of the time.
2. The condoning of slaves / servants in the Bible differs vastly from what we commonly think of as slavery.
3. They often benefited as they often had little other means to support themselves, and in one sense it was similar to the practice of having a contract with an employer in our society.
4. Israelites were only to have slaves for 6 years and then let them go free (Exodus 21:1-11). But a slave / servant could be bound to their master for life if hey wished to stay. This highlights an ideal that the slave would actually prefer to stay and serve their master because if was a place of benefit and well-being.
5. In this context the command for slaves, even wives and children (Ephesians 5:21-6:9) to submit is based on the principle of showing the other a better way, and at the same time the master, husband, or parent is command to treat the other with love and respect.
Just a few thoughts.
Untrue on both counts.
Numbers 5:11-31 is quite likely discussing just that, and abortion itself predate the Bible.
en.m.wikipedia.org
That's about adultery and a means of preventative warning against unfaithfulness, for Israel under the Mosaic covenant. It is not a broad statement which we can simply plug into 21st century context.