The difference is that Evolution is a theory supported by a weight of evidence, Creation and Intelligent Design are both hypotheses based on no physical evidence which don't make testable predictions. So Evolution is subject to constant scrutiny (and constantly holds true) whereas the 'other' two can't be proved or disproved because there's no evidence to investigate, and no predictions to validate.
Any debate about the differences between ID and Creation are also futile because they're the same idea with the 'god of the gaps' shrinking into the narrowing abyss.
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