Naturalism vs. Supernaturalism

Naturalism- commonly refers to the viewpoint that laws of nature operate in the universe, and that nothing exists beyond the natural universe or, if it does, it does not effect the natural universe. 

Supernaturalism- the theological belief that a force or power other than man or nature is ultimate. 

Although I can understand the viewpoints on both naturalism and supernaturalism, I also believe that it is unethical to subscribe to any type of "supernaturalism." How can one believe in something without logical evidence?

The answer, by some, is seemingly simple: It's their faith. 

Faith, as defined by the dictionary, is a confidence or trust in a person or thing, and it is a belief that is not based on truth. 

So again, how is it that one can believe in something without logical evidence?