duh
Christianity is also not the only religion that provides instructions (such as guidelines for the treatment of slaves) relevant to a particular time place and circumstance.
Plenty of jews in NYC that are totally heedless of the guidelines laid out for camel maintenance
:shrug:
Maybe it was justified in their own minds back 2000 years ago, but how do you explain fundamentalist Christians still holding to the same views, still supporting slavery based on the same verses 1800 years later in a completely different part of the world? There is no justification. And that is precisely why, when people adhere to every word of their holy books, when they believe in that that bible is inerrant and is timeless, that's when religion becomes dangerous. And unfortunately there are still a vast number of people that follow these outdated and immoral scriptural principles.
This same concept, as you have stated, transends into most other religions as well. Between Judaism, Islam and Christianity, their holy scriptures contain some of the most inexcusable crimes and injustices, condoned by their God's themselves.
There is no excuse whether one is mentally sane or not. If you believe that God had asked you to kill your own son for the purpose of a primitive sacrificial ritual, would you? For those that are extremely pious (and/or mentally disturbed), they have no problem committing such an atrocity because it allows it within their holy books. Of course, we like to think that we've advanced from such stupidity. But this is not always the case. Left and right, we find mothers drowning their own children in bathtubs because "God told them to". We still find wars waging around the globe (mainly in the Middle East) because they believe that they are granted divine providence and the support of their one true God, and more importantly, the word for word condonement of murder and war within their scriptures. Humans are stupid. Many do not understand that their bibles, their scriptures, have very little moral ground in today's society. We've evolved. Times, governments, beliefs, borders, morality - they've all changed. And with the change in these things, we must be willing to let go of the past commandments that are set forth in religious texts as they no longer apply in our world. Granted, there are some universal moral truths that are put forth, such as (some of) the 10 Commandments. Do not kill, honor your folks, etc. But those are unfortunately the minority in most all scriptures.
When you read the Qur'an, The Bible, the Torah and many others, you find that God himself has commanded his followers, with no expiration made clear, that they are to kill non-believers, sodomites, and anyone who goes against their teachings or even questions them.
Though religion, more specifically monotheistic religions, can produce some good in people, it is more often used as a scapegoat in order to commit the most astrocious crimes against humanity. Religion limits individual freedoms, potential postive morality and our own abilities of reason and logic. These are, upon the review of the past 2500 years, inarguable statements of truth that have been proven time and time again.
Simply put, organized religion has caused more death and harm than any other man-made concept in the history of humanity. The slight good that can, and occassionally does, come out of religion tends to be mainly done because the believer must do it to avoid some sort of divine retalliation. They want to "look good" in front of their Creator. So in essence, they aren't committing good acts for the benefit of humanity but rather for their own benefit. Again, I reiterate, there are some obvious exceptions to that; some people actually do genuinely care about their fellow human beings.
The in summary, their negative acts strongly outweigh the postive. That is why we must leave religion behind and move forth with a new social morality where there are no excuses to commit evil. And for those who refuse to put down their bibles, who will only adhere to the illusion of it's inerrency, we must leave them behind as well. In our day, we have little time to allow the false dogmas, the outdated commands and the illusioned beliefs to have control of even the slightest bit of our existence. Now is the time for facts, evolution, knowledge and growth. If we want to become a better and more productive and efficient species, we need to let go of the immoral behaviors that we've held onto for far too long.