Cultural Relativism, or, I find it strange what people find strange

I see an occasional story classified as "Weird News" that isn't weird to me. Here's one: Nepal's capital suffers festival goat shortage. Here's another: Camel Sacrifice at Istanbul's Ataturk International Airport Gets Turkish Airlines Worker Fired.

What's weird to me is, this is not weird. In every region of the world, religious practice for millennia included animal sacrifice. The Jewish holy writings often consist of rules for animal sacrifice, or accounts of various people performing the ritual. (This is just a small sampling.) For all you Christians, there is a quote in one of the Gospels of Jesus ordering a follower to perform (or rather pay for) the ritual sacrifices: Luke 5:14.

So why is it so strange to someone who theoretically believes the Bible to be a historical account, and the rules there to be divinely mandated, when people in another part of the world practice animal sacrifice? I mean, is it really not taught in school in the USA that Muslims still sacrifice animals as God commanded?

What I find interesting is more subtle questions. For instance, in India Hindus have mostly stopped sacrificing animals and now often deny that they ever did (despite the clear words of the Rig Veda), while in Nepal the older custom continues. It's a nice parallel to the fact that modern Jews no longer perform the sacrifices, while our cousins and fellow Hebrews the Samaritans still obey the Lord's orders and kill animals on the mountaintop altar.