Because you keep approaching the Theory of Evolution as if it is a belief system. It's not. It is only and exactly a scientific theory in which most scientists have a high degree of confidence.
And here's another secret: if a discovery is made that runs counter to the structure created by the theory of evolution, and another theory is proposed that sucessfully encompasses everything we know now plus that new discovery, then I, for one, will cheerfully abandon the current theory in favor of the new one.
It happened to geocentrism, classical mechanics, relativity, and leech cures. But right now there are no serious anomalies unexplained by evolution, and no other theory which better explains the evidence.
What is the difference between "faith," "belief system," and "high degree of confidence?" A "high degree of confidence" in WHAT? A "high degree of confidence" in a "process" that has yet to be fully explained!