I have been reading through this forum and I must say many posts have just left me shaking my head at the lengths some will go to deny that which they choose not to believe. I do not desire to engage in a scientific debate, so I will not go down that road. What I will share is my opinion. I believe in the creation by the Word of God, but I also believe that evolution does have some merit to it, so I do not discount it out of hand; nor do I believe in a young earth.
The OP asked for a creationist to describe the theory of evolution. What I can tell you about the theory of evolution is that it is a theory. But if you want to debate the scientific theory of evolution against the creation account found in the Bible, then you must do so from the same frame of reference. When somebody defends the creation account, they do so from a perspective of belief, and belief alone. They can offer no evidence to prove creation, yet they discount science for the lack of apparent evidence in its behalf. So the question should not be whether the theory of evolution is factual, or scientifically provable; to accurately debate creation verses evolution the only question that one should ask: is the theory of evolution believable? To that question I say yes. Is it believable that God created all things? And to that I also say yes.
Some might say the theory of evolution has to do with the origin of species, with a creature that crawled out of the primordial mass and out of the water to walk upon the land. Some might argue over one species transforming into another. It does not matter whether it is true or not; it is a theory. What does matter is whether or not it is believable.
I grew up on a dairy farm in western New York. On each side of my Dad’s land were two smaller creeks that had some water in them much of the year. We had a pond, and a half mile further up the road was another larger creek. When I was young I used to love going down and playing in the creek. In the creek I found these little fish swimming around, though they weren’t fish, they were tadpoles. And day by day I would go down to the creek and watch the fish, I mean tadpoles, and something amazing was happening, they we're transforming. Over a period of time they began growing appendages, and their tails got shorter, and pretty soon they crawled up out of the pool of water in the creek and hopped along the bank as a frog. What I saw for myself as a kid does not prove or disprove the theory of evolution, but what it did do is make it believable.
As a kid I also saw these creatures that were a little large than a worm, crawling around the branches and eating the leaves and vegetation. They were called the caterpillars. But these creatures did something strange too. For after a while this caterpillar would spin itself into a cocoon and die, or did it die? For eventually out of that cocoon springs forth a butterfly that flies away. Did God create the caterpillar? Or did God create the butterfly? What I saw as a kid does not prove or disprove the theory of evolution, but what I did see was a creature that crawled upon its belly transform into a creature with wings that soars through the sky. Can anyone rightfully deny what I have seen for myself by saying its not in the Bible and therefor not believable?
And who says evolution is not in the Bible. The very act of salvation and being Born Again is itself a form of evolution: for you are sown in corruption, and raised in in-corruption; you are sown in dishonor, and raised in glory. You are sown a natural body, yet raised a spiritual body.
In the creation account in Genesis 1 we find it written that God created man and women. In the image of God created he them, man and woman. Yet in Genesis 2 we find that Adam was created and formed from the dust of the ground, and that some time later came the woman, who was not created in the same manner, but instead was taken from the man. For the Bible tells us that Eve was formed from the rib taken from Adam. Some might identify that act as a form of evolution. Now if it is so easy to believe God could create from the rib of Adam the woman Eve, transforming a piece of the man into a new creature called woman. Why is it then so difficult to accept that the theory of evolution is quite believable. One theory of evolution teaches that one species evolved or transformed into into an entirely new species. Fossil records and scientific study have demonstrated a significant amount of similarities between the species. So if the Bible tells us that the woman was created afterward from a rib taken from the man, who is to say then that the creation process of God couldn’t possibly have involved taking from one species to form another? I believe the creation account of Adam and Eve in the Bible may offer precedent therefore to justify the possibility that the creation account of God just might have employed processes that the scientific world has defined as evolution.
A creationist looks at a high rise building, and believes that God spoke it into existent, fully complete and furnished with lights and running water. The scientist on the other hand does not look at the builder, but instead studies the building. How was the foundation laid, how was the brick and mortar set. How was it reinforced to carry the load. They may look at a similar building, and yet see differences that make each building unique and yet fitted for its own purpose. The creationist admires the same building as does the scientist, and yet goes to great lengths do denounce or discredit those who study how the building was built, or why they may have been built differently. The Bible says that God is patient and long-suffering: If this is so, why then insist that creation happened in an instant?
I think that creationists and Christians who go to great lengths to denounce or discredit the theory of evolution out of hand or insist that the earth is only six thousand years old do more harm to the kingdom of heaven and to the gospel of the Christ than any scientific theory could ever possibly do. There is no proof or disproof to the theory of evolution; And there is no proof or disproof to the theory of creation. They are what they are, a belief, and the only way that we can honestly measure the two is from the platform of belief. For the sake of the gospel, it does not matter if the theory of evolution is right or wrong, true of false, it only matters if the theory is believable; and I tell you from my experiences and the things that I have seen for myself in this world, that the theory of evolution is very much believable whether it is real or not.
As a Christian we are called to make known the salvation of the Lord and to be a witness for the kingdom of heaven; A kingdom of Spirit. A kingdom many nonbelievers would label as make believe. But If you continue to deny those things that seem readily apparent and most likely believable in this world, or continue to try and discredit my beliefs, then why would I trust to listen to you concerning the kingdom of Heaven and the invisible things of God if you can not honestly acknowledge the beliefs concerning the visible things of this world?