What utter bollocks! I'm sorry but that is rubbish.
First of all you have to understand the scientific use of the word "Theory" is different to the popular "domestic" use of the word "Theory". "Scientific Theory" results from the application of scientific methods in a way to explain phenomenon or sets of phenomena based on extensive research, evidence and testing.
Seen as you brought up evolution, and your disbelief of it i'll use THAT as an example...
Evolution is an on-going process, It doesn't just stop. Therefore it can (and has) been observed. The easiest example being Bacteria, There are many Antibiotic resistant strains of common illnesses, These Antibiotic resistant strains have
evolved from earlier strains that were very susceptible to the Antibiotic. Bacteria evolution has also been observed in many other forms of bacteria, For example the Escherichia coli virus has been observed mutating into new strains with completely different Genetic makeup in as little as 4 days. Also, theres several documented instances of Speciation (When one species evolves into another.) involving multi-cellular organisms [
Info]. Theres also molecular test results from tests carried out on various plants and animals that support the scientific theory of evolution. Hell, Just look at corn snakes. The amount of different colour morphs available, All stemming from a single mutation - THAT is Evolution through inheritable mutations.
http://cornsnakes.com/forums/showthread.php?t=62986&page=12
Unexplained Experiences... and LOLghosts - Page 12 - CornSnakes.com Forums
Want more evidence of evolution? Look it up on the net... theres hundreds if not thousands of points to consider. Shared Pseudogenes between species. The fact that many different species can interbreed (Donkey/Horse = Mule.).
Scientific theorys are not just pulled out of someones imagination, like other things i can think of have been. They've been tried and tested many, many times before they are accepted as fact.
Do you deny gravity exists aswell?.