schnell, you asked: What's your alternative theory? What's your evidence for this alternative theory?
Why search for the alternative theory—we have experience and evidence. I supplied sperm and my wife supplied egg—and we have two children. We have not designed sperm or egg (which obviously means someone else designed it). When we speak about design, what comes first is the DNA the code of which fills me with astonishment. Someone who writes an instruction manual does so with purpose. In every cell of our bodies there exists a very detailed instruction code, much like a miniature computer program. As you may know, a computer program is made up of ones and zeros, like this: 110010101011000. The way they are arranged tell the computer program what to do. The DNA code in each of our cells is very similar. It's made up of four chemicals that scientists abbreviate as A, T, G, and C. These are arranged in the human cell like this: CGTGTGACTCGCTCCTGAT and so on. There are three billion of these letters in every human cell!!
Just like an employer directs his employees work, DNA instructs the cell. DNA is a three-billion-lettered program telling the cell to act in a certain way. It is a full instruction manual. One has to ask....how did this information program wind up in each human cell? These are not just chemicals. These are chemicals that instruct, that code in a very detailed way exactly how the person's body should develop. Natural, biological causes are completely lacking as an explanation when programmed information is involved. You cannot find instruction, precise information like this, without someone intentionally constructing it.