The doubt does not contradict the faith, but they go together. As soon as it is not necessary to prove the models of new reality in the science, but it is needed to deal with the refutability1 of models, likewise the religious faiths and the notions of future of our everyday life are under continuous control and under feedback.
What we know, we do not know a hundred-percent certainty, let alone our faith is only an open potentiality. In addition, the faith is vitiated by the self-interest and the knowledge is also polluted with it.
The doubt is based on the knowledge, that our knowledge is finite, and partial, so the resulting belief system is even more restricted. No matter how it sounds paradoxical, not the scepticism, but lack of the doubt means the ignorance.
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1See Karl Popper's theory of potential falsifiability as the criterion demarcating science from non-science.
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