Flight is a scientific theory. Gravity is a scientific theory. Most of physics is scientific theory. If you do away with anything labeled 'theory' then you depopulate the science curriculum. Whatever's left will certainly be prestigious though, won't it?
The difference between the examples you have chosen and evolution is that the others can be proven. Evolution cannot. There is no way to re-create evolution in a lab - or to demonstrate such using the traditional scientific method. There is a great difference. Evolution is a non-provable theory. There are (at least to my knowledge) no transformational fossils.