http://www.doesgodexist.org/Phamplets/Mansproof.html
THE BEGINNING
If we do exist, there are only two possible explanations as to how our existence came to be. Either we had a beginning or we did not have a beginning. The Bible says, "In the beginning God created the heaven and the earth" (Genesis 1 :1). Most atheists maintain that there was no beginning. The idea is that matter has always existed in the form of either matter or energy; and all that has happened is that matter has been changed from form to form, but it has always been. The Humanist Manifesto says, "Matter is self-existing and not created," and that is a concise statement of the atheist's belief.
The way we decide whether the atheist is correct or not is to see what science has discovered about this question. The picture below on the left represents our part of the cosmos. Each of the disk shaped objects is a galaxy like our Milky Way. All of these galaxies are moving relative to each other. Their movement has a very distinct pattern which causes the distance between the galaxies to get greater with every passing day. If we had three galaxies located at positions A, B. and C in the second diagram below, and if they are located as shown, tomorrow they will be further apart. The triangle they form will be bigger. The day after tomorrow the triangle will be bigger yet. We live in an expanding universe that gets bigger and bigger and bigger with every passing day.
Now let us suppose that we made time run backwards! If we are located at a certain distance today, then yesterday we were closer together. The day before that, we were still closer. Ultimately, where must all the galaxies have been? At a point! At the beginning! At what scientists call a singularity! In 1999, it was discovered that the galaxies are accelerating in their expansion. Any notion that we live in an oscillating or pulsating universe has been dispelled by this discovery. The universe is not slowing down, but speeding up in its motion.
A second proof is seen in the energy sources that fuel the cosmos. The picture to the right is a picture of the sun. Like all stars, the sun generates its energy by a nuclear process known as thermonuclear fusion. Every second that passes, the sun compresses 564 million tons of hydrogen into 560 million tons of helium with 4 million tons of matter released as energy. In spite of that tremendous consumption of fuel, the sun has only used up 2% of the hydrogen it had the day it came into existence. This incredible furnace is not a process confined to the sun. Every star in the sky generates its energy in the same way. Throughout the cosmos there are 25 quintillion stars, each converting hydrogen into helium, thereby reducing the total amount of hydrogen in the cosmos. Just think about it! If everywhere in the cosmos hydrogen is being consumed and if the process has been going on forever, how much hydrogen should be left?
Suppose I attempt to drive my automobile without putting any more gas (fuel) into it. As I drive and drive, what is eventually going to happen? I am going to run out of gas! If the cosmos has been here forever, we would have run out of hydrogen long ago! The fact is, however, that the sun still has 98% of its original hydrogen. The fact is that hydrogen is the most abundant material in the universe! Everywhere we look in space we can see the hydrogen 21-cm line in the spectrum--a piece of light only given off by hydrogen. This could not be unless we had a beginning!
A third scientific proof that the atheist is wrong is seen in the second law of thermodynamics. In any closed system, things tend to become disordered. If an automobile is driven for years and years without repair, for example, it will become so disordered that it would not run any more. Getting old is simple conformity to the second law of thermodynamics. In space, things also get old. Astronomers refer to the aging process as heat death. If the cosmos is "everything that ever was or is or ever will be," as Dr. Carl Sagan is so fond of saying, nothing could be added to it to improve its order or repair it. Even a universe that expands and collapses and expands again forever would die because it would lose light and heat each time it expanded and rebounded.
The atheist's assertion that matter/energy is eternal is scientifically wrong. The biblical assertion that there was a beginning is scientifically correct.
THE CAUSE
If we know the creation has a beginning, we are faced with another logical question--was the creation caused or was it not caused? The Bible states, "In the beginning God created the heaven and the earth." Not only does the Bible maintain that there was a cause (a creation) but it also tells us what the cause was. It was God. The atheist tells us that "matter is self-existing and not created." If matter had a beginning and yet was uncaused, one must logically maintain that something would have had to come into existence out of nothing. From empty space with no force, no matter, no energy, and no intelligence, matter would have to become existent. Even if this could happen by some strange new process unknown to science today, there is a logical problem.
In order for matter to come out of nothing, all of our scientific laws dealing with the conservation of matter/energy would have to be wrong, invalidating all of chemistry. All of our laws of conservation of angular momentum would have to be wrong, invalidating all of physics. All of our laws of conservation of electric charge would have to be wrong, invalidating all of electronics and demanding that your TV set not work! Your television set may not work, but that is not the reason! In order to believe matter is uncaused, one has to discard known laws and principles of science. No reasonable person is going to do this simply to maintain a personal atheistic position.
The atheist's assertion that matter is eternal is wrong. The atheist's assertion that the universe is uncaused and selfexisting is also incorrect. The Bible's assertion that there was a beginning which was caused is supported strongly by the available scientific evidence.
THE DESIGN
If we know that the creation had a beginning and we know that the beginning was caused, there is one last question for us to answer--what was the cause? The Bible tells us that God was the cause. We are further told that the God who did the causing did so with planning and reason and logic. Romans 1:20 tells us that we can know God is "through the things he has made." The atheist, on the other hand, will try to convince us that we are the product of chance. Julian Huxley once said:
We are as much a product of blind forces as is the falling of a stone to earth or the ebb and flow of the tides. We have just happened, and man was made flesh by a long series of singularly beneficial accidents.
The subject of design has been one that has been explored in many different ways. For most of us, simply looking at our newborn child is enough to rule out chance. Modern-day scientists like Paul Davies and Frederick Hoyle and others are raising elaborate objections to the use of chance in explaining natural phenomena. A principle of modern science has emerged in the 1980s called "the anthropic principle." The basic thrust of the anthropic principle is that chance is simply not a valid mechanism to explain the atom or life. If chance is not valid, we are constrained to reject Huxley's claim and to realize that we are the product of an intelligent God.