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Being a skeptic just means being rational and empirical: thinking and seeing before believing.

I am the skeptic of skeptics.

The skeptic does not mean him who doubts, but him who investigates or researches, as opposed to him who asserts and thinks that he has found.

The fact that an opinion has been widely held is no evidence whatever that it is not utterly absurd.

Circumstantial evidence is evidence.

Refusal to believe until proof is given is a rational position; denial of all outside of our own limited experience is absurd.

Such evidence is not the only kind which produces belief; though positivism maintains that it is the only kind which ought to produce so high a degree of confidence as all minds have or can be made to have through their agreements.

Argument is conclusive, but it does not remove doubt, so that the mind may rest in the sure knowledge of the truth, unless it finds it by the method of experiment.

You can't prove any hypothesis, you can only improve or disprove it.

Denialist arguments are often bolstered by accurate information taken wildly out of context, wielded selectively, and supported by fake experts who often don't seem fake at all.