The simple answer: creation science believes that the universe, planet, and all life on it were created by a supreme being (God). The theory of evolution holds that all life on the planet derived from one or few common ancestors (all living things are related = common descent). In essence, life on the planet was an "accident" or normal outcome of natural processes that had no "creator" or "divine architect".
A major philosophical difference between the two ideas is creation "science" is not really a science at all. To be a science is to follow the scientific method. Make observations, form hypothesis, experiment to test hypothesis, collect data, form conclusions, publish your results so other scientists can verify them. Models or hypothesis that fit the available data and cannot be disproven are kept while other ideas are discarded.
Creation science operates in the reverse direction. The answer- "God created" is already present and assumed to be correct. Data and results are then gathered to support that answer. Any data that does not agree with this assumption is discarded or ignored. (The courts have agreed with this in legal cases involving evolution versus creation science).
Evolution, on the other hand, has to adhere to the existing rules of science and the scientific method. Any hypothesis that does not fit the data must be discarded.
What is "it"? Do you mean the theory of intelligent design?
I understand the question relates to difference between the theories of creationism, and what are that major premises of the theories.
Creationism and evolution are two alternate theories that describe how the world, as it exists today, came into existence. The theory of creationism is based primarily on the explanation given in bible and other religious texts. It holds that the entire world was created by God, or some such being in a very short time, and that all the plants and animals that exist today were created in their present form from the beginning of whole creation or the universe. For example it holds that humans have existed on the earth from the beginning of the earth itself. Many people have tried to prove the correctness of the descriptions of creation in ancient texts on the basis of modern scientific knowledge. This type of theory of creation propped up by scientific arguments is sometimes called scientific creationism.
The theory of evolution on the other hands does believes that all living things on the earth including all plants and animals have probably evolved out of just one species of single cell form of life, in a process of evolution extending over 3.5 millions of years The theory of evolution deals only with the origin and development of all forms of life. It is not concerned with how the Earth or other heavenly bodies such as Sun, Moon, or stars came into existence.
The theory of Evolution was developed by Charles R Darwin and formally presented in 1858. There are several interrelated premises that explain the process of evolution.
- All living things undergo changes in their inherited characteristics over a period of time. Each of these change is due to the process of mutation, or change in genes of the organism.
- Each of these changes is very small but cumulative effect of these changes results in entirely different species of living beings. Thus all the plants and animals existing today are have evolved out of some other types that existed long ago.
- In a process of natural selection, organisms that are most suited to their environment tends to leave most decedents. As a result the number of species best suited to their environment tends to grow, while the number of those comparatively less suited tends to diminish. In this process, also called survival of the fittest, some of the species may also become extinct.