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Evolution has been directly observed. Evolution, like gravity, is an observed phenomenon.

The difference with evolution is despite the mis-characterization of it (either intentionally to misguide, or out of poor information), the theory of evolution which attempts to explain the observed phenomenon (like Einstein's theory of gravity attempts to explain the observed phenomenon of gravity) and does so with tremendous success.

Millions of confirmed observations that fit within the theory, millions of predictions that have been confirmed, massive consilience between every field of investigation that touches the subject, and a complete lack of either an opposing theory which has any explanatory power or makes any predictions or evidence which disproves the theory.

That kind of "belief" is different than faith in claims that are either difficult or (by the reasoning of the very people making the claims ) impossible to demonstrate (because demonstrating the claims would violate free will).