There is a word in the Bible that becomes very problematic for people wrestling with the idea that God used evolution in creation - the word "kind." In Genesis 1:20-23 the Bible documents the work that God did on the 3rd day to create sea creatures and birds of the air. The Bible is clear to explain that God created these different types of living things as separate beings and the Word uses the word "kind" to differentiate between the two. While that might not seem like a big deal on face value, it puts people who read the Bible who seek to interject worldly wisdom such as evolution theories in a tough position. Evolution theories present the idea that all life came from the existence of a simple-celled organism, and over billions of years, that simple-celled organism developed variances in its genetic code that allowed it to adapt to a changing environment. Therefore, when one follows the evolutionary model down the line far enough, at some point one must deal with the idea that fish became birds. This idea is completely contrary to the teachings of the Bible.
Genesis 1:20-23 states that God created fish and birds on the same day (a literal 24-hour day), and that each was created according to "its kind." The use of the word "kind" shows that each creature was a different type. God created each type of creature distinctly different from the other. The Bible shows that God created fish with a set of genetic traits that was different from the genetic traits of birds so that each group would have been unique in its DNA makeup. This is the same word that is used to describe the manner in which God placed animals on the ark. Good Bible students examine the testimony of Noah's ark and understand that God did not place 2 of each animal on the ark. Instead, God placed two of each "kind" of animal on the ark - for example, two of each "kind" of K-9, rather that 2 of every type of dog. Since God placed an abundant amount of information within the DNA of every living thing, there is the possibility of great variation within each "kind." Nevertheless, since one cannot add information to one's DNA, but only subtract or mutate, the use of the word "kind" is appropriate to describe God's creation of birds and sea life. This word presents challenge for evolutionists since the millions of fossils that have been discovered do not clearly present a transitional form where a fish is becoming a bird, or a monkey is becoming a man. People throughout history have sought to fool the public by presenting the fossils of transitional forms such as "Lucy," "Piltdown Man", or "Archaeopteryx." Over time, those fossil presentations were discovered to be hoaxes and the fossils of other living creatures that were not transitional forms. The difficulty of finding a transitional form comes from the point that there isn't one. the scriptures clearly and boldly claim that God made two distinct "kinds" of animals without using one to make the other. God made the various forms sea creatures genetically different from the birds.
While some claim that evidence of evolution may come from birds because of cosmetic and functional changes that have occurred over time, one must understand the concept of "adaptation" and that adaptation is different than evolution. No matter what sorts of changes one can observe in birds, reptiles, or mammals, each always remains as a part of its "kind" just the way God made it. Though birds, reptiles and mammals change, birds do not become reptiles and reptiles do not become mammals. If read the simple way that God intended, the creation account in Genesis becomes very simple. If one is willing to submit to the truth that "in the beginning God created" then the rest is very easy to understand. The same God who spoke light into existence is surely capable of speaking living sea creatures and birds into existence as genetically unique life forms in one day. The God who spoke the sun, moon, and stars into their particular place is surely able to speak the sea creatures and birds into existence in 24 hours as genetically unique "kinds." It is when one seeks to change the identity of the Living God that one's thoughts about the manner of His work in creation (and in other facets of life) become compromised according to the scriptures. God's creation methods are very simple in concept when one is seeking to trust the God who documented His work. Since the world around us supports the claims of the Bible, God provides little reason to doubt.
The question then becomes, will we surrender our flawed wisdom to trust in the superior wisdom of the Living God? The God of the Bible is all mighty, all powerful, all knowing, eternally existing within Himself, sovereign over all things, and in no way dependent on anything but Himself. Understanding this truth and trusting in it makes the scriptures much easier to grasp. God created as the Word is written so that He even shares His purpose in creation. God commanded the sea creatures and birds to be fruitful and multiply. This is a command He will repeat to all of His living creation. God desires life and loves life since He is the essence of life. His desire in creation was for His creation to be fruitful according to His standards of what is "good" since any other standard is not good. To learn these truths about the Living God through the truth of His Word is a blessing. Receive the blessing from God by His Word!