Doubting thomas is a pejorative term. There are a chain of assumptions one has to choose to believe to come to that conclusion. Its knocking people that are not willing to jump to those conclusions and not really providing a substantive rebuttal.
Its also one of the worst parts of religion, right along with priming people for authoritarianism and a lack of a coherent moral code, IMO. Demanding evidence is a good thing and we demand it in just about every other area of life. It should be no different here.