You know, I am aware that I come across as lecturing and no one likes to be lectured at. I know I nee. To reduce my word count but I find that his questions contain so many misconceptions that I need to explain basic concepts in some detail. A misconception can be contained in sentence but correcting a misconception can take thousands of words or even whole books. How do others deal with this?
Here's my preface to my email about the evidence for evolution:
your first question is whether evolution is a fact or a theory. The answer is it is both. This may seem like a contradiction in terms but the word 'theory' has a different meaning in science than it does in every day use.
In science, a theory is a well-substantiated explanation of some aspect of the natural world. For example, gravity is a theory but it is also a fact. If I drop a ball it will fall to the ground - this is an observable fact. The explanation of how gravity works however is a theory (and an incomplete one). The fact that the explanation of gravity is a theory in no way calls into question the existence of gravity. The ball still falls to the ground.
In science a theory is really just another word for explanation, it is not an admission by scientists that they are unsure or just speculating. For a scientific theory to become widely accepted it has to be confirmed to an extremely high degree with supporting evidence and rigorous testing. Scientific theories can never become facts because there is always the chance that a new discovery will invalidate them in some way but some theories become so well established that it is unlikely they will ever be overturned completely. Einstein's Theory of Relativity is a good example of this.
Einstein's theories have proven so successful and accurate that they are used in GPS sattelitre navigation systems to calculate the relative positions of sattelites. If Einstein's theories were wrong then GPS wouldn't work and yet Einstein's theories are still considered 'theories'.
The idea that it is unwise to believe in a theories is really based on an Misunderstanding of what a scientific theory is. In reality saying this is the same as saying that it is unwise to believe in well substantiated scientific explanations but no one would agree that this is true. We all accept scientific explanations as true in our every day lives.
For example it is not unwise to believe in the germ theory of disease and it is not unwise to believe in the theories of flight aerodynamics that explain how an aircraft wing creates lift. We know these thing work - the theory refers to the explanation of how they work.
So how does this apply to evolution - how is evolution both a fact and a theory? Well, the evidence that species evolve over is strong that scientists consider the historical occurrence of evolution is a fact. the 'Theory of Evolution' refers to the explanation of the mechanisms that drive evolutionary change.
There may be valid reason to doubt evolution is true but its status as a 'theory' is not one of them.
Your second question asks for proof that evolution is a fact. The evidence for evolution is vast and would be impossible to summarise in just one email. What I will do instead is describe the three lines of evidence that personally convinced me that evolution is true. I don't think expect this will convince you but I hope it least helps you understand why others accept evolution as true. It might even help you sharpen your own arguments against evolution.
Before I do that however I need to clarify what evolution is. In your email you said that no one has been able to explain to you what the evidence for evolution is but then you asked for proof that life started without intelligent design.
It is a misconception that evolution attempts to explain how life started. The origin of life and the evolution of life over time are seperate fields of study. The chemical processes that scientists hypothesise led to the emergence of life are quite different to the mechanisms that drive evolutionary change so seperate theories are required.
Personally I don't know how life started. I think it is possible that life originated through chemical processes but it is also possible that it was created. I just don't know and there is nothing wrong with admitting that when there is insufficient evidence to form a conclusion either way.
so, what is evolution? It is the change in inherited characteristics in biological populations over time.