Some religious beliefs do make predictions. These predictions can be tested. If a religious belief fails a test, it is the test that contradicts that religious belief. The theory which makes the correct prediction should have nothing to say on the matter. This does not mean that scientists don't sometimes make the mistake of saying a theory contradicts something.
Evolution is based on the scientific method.
There are tests that can determine whether or not the theory is correct as it stands, and these tests can be made. Thousands of such tests have been made, and the current theories have passed them all. Also, scientists are willing to alter the theories as soon as new evidence is discovered. This allows the theories to become more and more accurate as research progresses. Most religions, on the other hand, are based on revelations, that usually cannot be objectively verified.