Entities [of explanation] should not be multiplied beyond necessity.
Put a little more plainly this maxim says that with any problem: All things being equal, the simplest solution tends to be the best one. When applied to different theories about nature, for example, this does not mean that nature is not complex, but only that, when accounting for any observed phenomenon in nature, the explanation that requires the fewest assumptions is most probably the correct one.
As well as being good philosophy, this method of reasoning is also sound science. For example, the main advantage of the Copernican Theory (that the earth revolves round the sun) over the Ptolemaic Theory (that the sun moves round the earth) was the reduction in the number of separate assumptions from 79 to 34. Later Isaac Newton was able to account for the movements of both the earth and the heavenly bodies by just one assumptionthe Law of Gravitation.
Let us apply Occams Razor to the two theories of origins, namely evolution and creation, and in particular to the respective answers to several fundamental problems which either theory must be able to explain in order to be viable. We will consider the evolutionists dilemma first.
1. Where did matter and/or energy come from?
If one says matter/energy is eternal, then as a logical consequence, the universe must be eternal. But the universe is running down in accordance with the Second Law of Thermodynamics, and sooner or later will reach heat deathwhen everything will be at the same temperature, a few degrees above absolute zero. If the universe was eternal, heat death would have happened a long, long time ago, but it hasnt. Therefore the universe is not eternal; it had to have a beginning.
If one says that matter/energy is the result of the alleged big bang, where did the energy for the big bang come from? If one says it came from the cosmic egg, there is unleashed a flood of assumptions, or questions for which evolutionists do not have answers.
For example, where did the energy of the cosmic egg come from? What caused it to be compressed into a single dimensionless point (a singularity, which is another way of saying nothing)? What triggered the expansion of nothing? If gravity was near infinite, i.e. the single point was a black hole, how come anything expanded? How come this explosive expansion produced all the order in the universe? And so on.
2. Where did life come from?
The next time you eat a can of beans or stewed fruit you might like to reflect on why it is that you do not die of food poisoning. The reason is that cans of food, after sealing, are sterilized by heat to destroy all the bacteria within them. Once all life has been destroyed, new life is not generated.
This is the Law of Biogenesis: Life gives birth to life, but non-life does not. Another place where this law can be seen at work is in a hospital operating theatre. The principle of asepsis (sterilization), arising from the work of Pasteur, Lister and others, depends on the fact that once all life has been eliminated, non-life does not and cannot produce life.
Where, then did life come from? The usual evolutionist answer is that it arose from some chance combination of atoms and molecules in some primeval soup. (The view of Francis Crick, called Panspermia, that life came from some other part of the universe, merely pushes the problem of lifes origin into the obscurity of outer space.) But this involves multitudinous assumptions and is contrary to thoroughly-proven principles like the Law of Biogenesis, which we test every day, as outlined above.
3. Where did information come from?
Living things are replete with information, stored mainly on their DNA. This information specifies how to make and use all the components of the living organism, how to reproduce, etc. Humans have some 3,000 million letters written on the DNA, which specify how to make over 100,000 proteins and much more, much of which is yet to be discovered (like how embryo development is orchestrated).
This sort of information specifies something. For example, the letter sequence soad tm eihwras euoolben says or specifies nothing and there is little to indicate that anything other than a random process was responsible. If someone rearranged the same letters into she owns a red automobile, we immediately recognize information that an intelligence created.
Random processes, whether evolutionary or not (i.e., with natural selection), cannot produce the voluminous information needed by living things. It is a totally unwarranted assumption to suppose that they do.
4. How do things change?
If, as per evolutionary theory, an animal needs to develop a particular organ (for example, a dinosaur developing wings in order to escape from its predators), such an organ would have no survival value in its intermediate stages. An animal whose front legs have become part-legs and part-wings could no longer run as fast, and could not yet fly. It is therefore less fit to survive, and by definition (survival of the fittest) the intermediate forms would be eliminated. So how did such things form?
The answers to these questions must be within the parameters that each philosophy (evolution or creation) lays down.
The theory of evolution postulates mutation, a chance random process, and natural selection. However, chance random processes cannot account for and are unable to originate matter/energy, or life, or information.
What then of the theory of creation? What are the creationist answers to these fundamental problems? None of these presents any problem at all to a creationist because creationism postulates an eternal, self-existent God who is all-powerful, all-knowing, and who exists everywhere at once. Thus for the Christian creationist:
1. The origin of matter and energy poses no problemthe omnipotent or all-powerful God created them in the beginning. Matter (nature) cannot be eternal, but God is.
2. The origin of life poses no problemthe eternal, self-existent, living God imparted life to plants, animals and the first human pair in His creation in the beginning.
3. The origin of information poses no problemthe omniscient or all-knowing God designed the order and complexity in the universe, and then gave man the intelligence to see and understand it and to use it. He spoke things into existencespeech involves information.
4. As to dinosaurs developing wings and turning into birds, how much simpler it is to think that God created dinosaurs to be dinosaurs and that He created birds to be birds. He created different kinds of organisms to reproduce true to their type. We observe that organisms reproduce only after their type and we now know the genetic basis for that.
According to Occams Razor, the simplest explanation or the one with the fewest assumptions that explains the facts is to be preferred. Creation makes one assumptionthat God is who He says He is in the Biblebecause if this is so, then He must have done all that He said He did. This adequately answers all the problems of origins posed above.
Evolution has many assumptions and none of them provides an answer to anything.
According to Occams Razor creation wins.