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We accept scientific theories because they're the most suitable explanations of what we observe. As soon as we discover a hole in the theory we patch it (see inflation in cosmology) or replace it with a more accurate representation (see the ether vs special relativity). There is, in a way, a sense of belief in some aspects of physics on the quantum level in which the mathematics drives the theory and occasionally disagrees with intuition. Take the Higgs Boson, for example. It was theorized, based on the mathematics in the 1960's. We "believed" it existed until it was actually discovered a few years ago.