Descartes Meditations Part 4

In Meditations Part 4 Descartes talks about the "Thinking Nature vs. Corporeal Nature". The thinking nature being a "thing" that is capable of thought and perception of ideas, not necessarily a body. This is because he is not even sure if the body exists, therefore, he calls us the thinking things. Descartes says that the thinking thing has four distinct characteristics: understanding, doubting, denying, and refusing. The corporeal nature being the spiritual nature. He wonders if the thinking nature and the corporeal nature are different things or if they are the same two in one kind of nature. Personally. I think that the thinking thing theory Descartes has in absurd. I believe that our physical bodies do exist, so I'm kind of confused as to where he got the idea that they don't exist from. I agree with him though that we have the four characteristics that he has mentioned, but that we have many more then what he states. I don't think that the thinking nature and the corporeal nature are the same thing at all. Sure, some people have a spiritual nature in some way, but it is not our entire nature. There are the spirits we believe in, such as God and then there are us. We have spiritual beliefs and in some sense a spirit in us, but they are not the same things.