To scientifically test a religious belief one first must find some empirical test that gives different results depending on whether the belief is true or false. These results must be predicted before hand, not pointed to after the fact. Most religious beliefs don't work this way. Religion usually presupposes a driving intelligence behind it, and an intelligent being is not always predictable. Since experiments judging religious beliefs cannot have predictable results, and may give different results under the same circumstances it is not open to scientific inquiry.
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.