Well said. The 'culture' of most animal populations would be considered immoral by western human culture. The physically strong generally dominate the physically weak and improve the chances their DNA will be spread. This practice is generally good for a wild population as it ensures the strong and best adapted organisms do the bulk of the breading; improving population strength.
We humans have insulated ourselves from the natural selection process though. Cultural evolution is now what effects us the most. We are slowly, but steadily, overcoming our violent and brutal nature through the inheritance of ideas. Dawkins calls the cultural ideas we pass to each other, memes.
The Abrahamic religions really just reflect the more brutal, male dominated, slave owning, ghost believing culture that existed at the time of writing. Like bad genes in a natural population, most bad ideas die out relatively quickly. Unfortunately, like a virus these religious 'memes' have evolved complex protection and reproduction systems.
The bad ideas have been granted a cultural suit of armour. We are told that religious ideas are divine, sacred and impolite to criticize. The ideas and protection systems are injected into us at a young age, before our mental immune systems are fully developed. Like any other virus, the religious variety is difficult to fight once it takes root. The host then acts as a carrier who spreads the viral ideas to others and contributes to their cultural defense system.
Fortunately, work is being done to strip away the protective sheath religious ideas still posses. Like medications though, the spread of these anti-virals is not uniform. More work has to be done to get them into the Middle East, Africa and even the United States.