Summations Only

What qualifies one as a scientist is following the scientific method.Credentials are nice but all the credentials in the world won't make a creationist into a scientist if the scientific method isn't followed.(We see a lot of that.)

It is.It is contradicted by massive amounts of evidence and supported only by an old tribal myth.And young earth is not a theory. That term has a very specific meaning in science. (See the definitions below.)Young earth is a religious belief. That means it does not need evidence, but is held as true no matter what.

Theory: a well-substantiated explanation of some aspect of the natural world; an organized system of accepted knowledge that applies in a variety of circumstances to explain a specific set of phenomena; theories can incorporate facts and laws and tested hypotheses. Theories do not grow up to be laws. Theories explain laws.

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Theory: A scientifically testable general principle or body of principles offered to explain observed phenomena. In scientific usage, a theory is distinct from a hypothesis (or conjecture) that is proposed to explain previously observed phenomena. For a hypothesis to rise to the level of theory, it must predict the existence of new phenomena that are subsequently observed. A theory can be overturned if new phenomena are observed that directly contradict the theory. [Source]