The cosmological argument for the existence of God is considered perfectly logical and straightforward to understand. The argument is: We exist, yet the possibility is there for us not to exist. Though the possibility not to exist is there, we still exist; thus, someone or something has caused us to exist. Meaning our existence is not based on our life; just as cornbread could not have produced cornbread, but something caused the bread to exist. We exist not by our power, but because of a cause. Our existence depends on something that causes our existence.
Today we exist. There has to be a cause for it. God is that cause, and we are the effect. The Bible teaches us that God created us, Gen. 1:26-27, in His image, Gen. 5:1; 1 Cor. 11:7; James 3:9; and we were created to glorify Him, Isa. 43:7. However, we quickly proved that we would like to glorify Him, but we often fail. And since we failed and created a schism between us and the cause of our existence, our Cause sent us a Redeemer; and through that Redeemer we can now conform to the express image of God through Christ, 1 Cor. 11:7; Heb. 1:3; Rom. 8:29; 2 Cor. 3:18; Col. 3:10.
The teleological argument is better known today as the “Designer” argument. This case is considered logical and straightforward to understand as well. William Paley (1743-1805) is famed for giving us the “Watchmaker” analogy, which helps us understand this argument. The “Watchmaker” analogy goes something like this: If you were walking through a field and found a watch, you would know that the watch did not just evolve out in the field. Instead, the watch was designed with many intricate parts and was made for a purpose. So if there is a design, then that means there must be a designer. The same would be true for the grass, weeds, and plants in that same field. They too did not just evolve, but something created them for a purpose.
So, as the watch did not form from a random formation, then it is only natural to believe that the flowers, weeds, and grasses of the field did not develop from a random formation as well. Many apologists will use illustrations about the eye to promote the designer belief. Within the eye, there are dozens of convergent parts. Each part on its own is worthless; yet when God molds those varying parts together, then we understand the real value and function of the eye. Who molded them together, a designer or random formation? Just as the watch, a designer molded the dozens of varying parts together to give us a time keeping device.
Paley would say since archeologists have discovered plenty of human artifacts, that is evidence of purposeful, intelligent design. The universe in itself resembles such artifacts; therefore, the universe is of design. And since its components are much more complicated than a watch, the designer must be much more intelligent than we are.
The Bible also supports this view. Romans 1:20, “For the invisible things of Him from the creation of the world are clearly seen, being understood by the things that are made, even His eternal power and Godhead; so that they are without excuse.” And even though people may try to change the image of God, the truth still stands, Rom. 1:20-32.