Which issues of killing are you looking at. Those ordered by God for war or according to the law?
It is a big question. I have looked into it myself, and while it is a lot of reading, you will be amazed at how humane things were actually done and why they were done! In fact that military tactics of the Israelites are astounding and their manner were entirely ethical putting to shame the ‘just wars’ being carried out today.
One thing you must understand is that the times back in the Old Testament Period were nothing like the comfortable lives we enjoy today. In fact, killing people was actually more merciful than leaving them alive in certain conditions.
Pay no attention to people like Perry5, once you discover how just and merciful God is, arguments like that will only display the utter ignorance people have about the Old Testament and the Christian God.
Do you have any particular examples of events that you wish to learn about? You can find the answer, but only if you’re willing to invest some lengthy time reading, trust me, it
WILL be well worth it. I will recommend these articles to you:
The Bible’s Command against Killing:
tektonics.org/lp/nokilling.html
The annihiliation of the Canaanites:
christian-thinktank.com/qamorite.html
The killing of the Amelkite Children:
christian-thinktank.com/rbutcher1.html
God unfair to Women?
Old Testament Laws pertaining to Virginity and Rape:
christian-thinktank.com/virginity.html
What about God’s cruelty against the Medianites?
Where God commanded the Israelites to kill all the Midianite males and adult women, and keep the virgin women for themselves:
christian-thinktank.com/midian.html
Was God being evil when He killed the first-born of Egypt:
christian-thinktank.com/killheir.html
Women in the Heart of God
How women are treated as equal of men while still maintaining their roles, in fact women are even given preferential treatment by God, believe it or not:
christian-thinktank.com/fem02b.html