I for one think it's wonderful to question what we think we know. Such thoughtful consideration will eventually yield good results. Maybe we'll come back to where we started but with a more firm underpinning as to why exactly we believe it. Or maybe we won't, and that's often good too, in order to cast off false beliefs e.g. in believing in Santa Claus or a childish view of a God who grants our every good wish but demands nothing in return. The important thing I always keep in mind is that TRUTH has nothing whatsoever to fear from honest inquiry.
Also, interestingly enough, we seem to be on the cusp of being able to rewrite our own DNA, thus what genes we have at any given moment may not matter to people in a hundred years from now:-P.