Of course evolution is not useless. It is extremely useful to some. My complements on your honesty regarding its uncertainty.
Does that mean we should stop teaching science?
Has anyone on these threads ever indicated that to be their desire? No one here is opposed to science. That is entirely a construct of the opposition.
Evolution has a similar status, as far as degree of certainty goes, as does quantum theory, relativity theory, and many other scientific theories.
Perhaps, if you think theories about unobserved phenomena should be equal to theories about observed phenomena.
Even if evolution were to be completely debunked, it would not necessarily render creationism true.
The creation does not become true by default as evolution fails. However, in any debate it is SOP to support your argument while dismantling your opponent's. The difficulty in this debate is not exposing the weaknesses of evolution, but (like Gore) getting the opposition to admit when they've lost.
So we've actually observed the curvature of space-time? What kind of instrument do you use to see this? Which instrument is it that allows you to observe quarks? Which one allows you to observe electrons? There is a whole lot of indirect evidence for all of these things, but there is no direct observation of them whatsoever.