Sorry, forgot to come back to this.
Worldly temptations, etc., uses world in the sense of
4. The inhabitants of the earth; the human race.
5.
1. Humankind considered as social beings; human society: turned her back on the world.
2. People as a whole; the public: The event amazed the world.
The idea here is that people are messed up, and evil is commonplace in human society. It is the evil of human society (lying, envy, hatred, etc., etc. etc.) that is supposed to be overcome. Being physical is declared good by God.
It is also true that Christian doctrine regards the physical world as also damaged by the effects of evil (in the same way human beings and human society are), but that is why God wants to fix it.
The Hebraic (and therefore biblical) understanding of human beings sees us more as integrated beings than as a comglomeration of parts. The "soul" in Hebrew is
nephesh which really just means "life" (or by extension, "a living being").
Nephesh is created by
ruach, which means "breath" or "wind," which in Latin is translated as
spiritus and thus leads to English's "spirit." So, to the Hebrew mind, what we call "having a soul" to them meant simply "being alive and breathing."
Now, at death, the Hebrews though that we are essentially ripped apart:
ruach leaves us, and we cease to be a
nephesh, but only maintain a sort of sleeping half-existence in
Sheol, the "grave" or the "pit." The biblically presented solution to this problem is resurrection: being made alive by having
ruach put back into our (glorious, transformed) bodies so that we are once again living beings.
This all fits within a larger understanding of the world that sees all creation, both material and spiritual, as part of one whole. This isn't exactly monism, because there are many things and they don't all have the same "substance" or "essence," but rather is the idea that it all happens in the same arena, or on the same plane of existence, or whatever terminology you want to use.
It was more common in Greek culture to consider souls and bodies as separate entities that happened to be joined together. Death simply dissolved a temporary association. This fits into a larger view of the world as consisting of two (or more) separate planes existence.
(As a historical sidenote, the spread of Christianity in Greek culture caused a collision of these two ideas. Sometimes people would beleive in both concepts without recognising the inconsistency, while others would choose one or the other. Since our own culture derives so much from Greek culture, it is common to find the inconsistent mixing of the two ideas in the minds of many people. This is, however, rare among theologians and teachers of Christian doctrine.)
Anyway, that was a long post to answer a profound question. Hope it helped.

EDIT: Oh, and there is a lot more variety than you might think in ideas about the soul and the afterlife, and so on. Shinto, for example, has no such concepts. The Old Kingdom Egyptians believed only that the Pharoah was a god and ascended to them after he died, whereas the Middle Kingdom Egyptians beleived everyone had a soul and the possibility of an afterlife. Buddhism and most forms of Hinduism see the soul as very separate from the body (as did Plato).
As for the Gnostics, their claims regarding special knowledge were the capstone of an entire system of thought, and the whole lot of it was considered heretical.