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That is a little misleading. The internal combustion engine exists, as does gravity. But theories of thermodynamics, chemical energy and reactivity, the mechanics and cause of gravity, or the mechanisms of evolution are all debateable, updateable (yes I made that up), and refutable theories. Science has to, and does, work that way. One does indeed believe in scientific theory, and while such belief is certainly more logically sound than beliefs in toothfairies and gods, it still requires an analyzation of evidence and comparison with competing theories.
But does anyone expect a Minister (or Secretary as it were in the States) to have knowledge and belief in every theory of science? I would hope not -- I doubt any elected government can exlain super-string theory or quantum gravity or differentiate between mechanisms of evolution or debate the virtues of Clementsian forest succession in forest management. That is what his advisors, the bureaucrats are for. Science requires such specialized knowledge that it would be insane to expect a minister be cable of comparing quantum and Newtonian gravity and still have enough room in his brain to understand the myriad of minor fields in biology, chemistry, engineering etc.
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Where there is doubt there is freedom.
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