To brand evolution as “just a theory” is the finest compliment one can confer on it! - Mordechai Ben-Ari

A scientific theory is a concise and coherent set of concepts, claims, and laws (frequently expressed mathematically) that can be used to precisely and accurately explain and predict natural phenomena.
A theory should include a mechanism that explains how its concepts, claims, and laws arise from lower-level theories.

If ghosts and witches are not yet altogether exploded, it is the fault, not so much of the ignorant people, as of the law and the government that have neglected to enlighten them.

Intelligent Design is simply a dead end; it does not deserve to be called a theory.