Deism

In class we talked about Deism for a little. The idea that the world is this clock set in motion by a certain deity and runs completely on its own, with the deity being no longer present. I see a problem here. In my previous post I described nature as something that always does things for benefit. All the animals do whatever they can to benefit themselves. Humans are one exception doing things that can also benefit others, such as caring for the endangered species for example. If this deity that created the "clock" is real then what would be the benefit of creating it if that deity removes itself from the the said "clock," instead merely setting it in motion? And since nature had to come from somewhere, in this case the deity, then would not that deity also have to belong to the concept of nature? So then if there is no benefit for the deity in creating this world then why would the world exist. Christianity for example portrays people as a sort of manifestation of god himself.  There is benefit for the god in that.  Deism gives no connection between god and the actual creation. For something to work there needs to be a process of parts that work in a relationship to each other. As in Aristotles relationship between the mover, the moved and that in which something is moved. In that way Aristotles theories and Deism are different. Does there need to be a working relationship between the deity and the world? What do you think?