You very seldom know for certain that anything is right or wrong. Mostly it is well motivated belief, to quote one physicist. In science belief in the truth of a theory depends upon its ability to accurately predict what will later be observed, or on its ability to account for the data already observed.
One day something might turn up which is genuinely incompatible with Evolution. If that happened there would be some burying of heads in the sand, but gradually belief in its truth would collapse.
Men long for certainty. They claim they have it. They postulate inerrancy in various places, such as scripture, the pope, a favored translation of scripture, science, and so forth . . .
But at bottom, we cannot ever know we have certainty. We can, however, assign probabilities and give provisional assent. I think it is very highly probable that water is composed of molecules made up of hydrogen and oxygen. I give this my provisional assent.
In casual speech, I'll say it is proven. But ultimately I acknowledge it is only very, very probable.
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