My view of Eastern "spiritualism", or whatever the British and other Western scientists and religious scholars thought they had found, is that it looks strange to someone who has been raised (since birth) in a paradigm that sees a single deity, and decries all others as "false". Me too, I grew up that way.
The Eastern mind and the reason for the inversion - where the sacrifice of an animal, is now the sacrifice of one's need for the animal - is cultural, obviously, but what are the different points of view? Why is the Western model exclusive and individualistic, whereas the Eastern one is inclusive and "dividualistic"? One side sees a "single" God, the other sees "all" Gods, as a single, the whole is the one.
In the West, it seems, the monotheistic paradigm was one that defended itself and fought off others, the Eastern one stayed open and adapted a universal, rather than individual paradigm.
I've been "interested" in Eastern ways of thought and meditation for most of my life. I believe that certain practises (of an individual nature), part of the science of Yoga, can help you to understand yourself in a way that seems available to the Western mind only through external, rather than internal processes. I could clarify that, but maybe later.
The ideas in both the West and East revolve around the abstraction of "sacrifice" and "sanctity".
We got these from the need to live in stable groups, in which food, and the getting and giving of it, became ritualised.
Music, dancing and singing (i.e. "play") all became activities that wove the religious notions we all still have today, which is about being thankful, that we can get food, that we can share it amongst ourselves, and we can stay in coherent social groups - as long as we don't start being un-thankful, un-helpful (not sharing, or finding food for the group). Then there's guilt, and shame and ostracism. We still do the same stuff today, as we did around the campfires; it goes all the way back.