In discussing presuppositionalism yesterday and today, the topic naturally turned to creationism (one of the biggest examples of presuppositionalism around). A few defenders of creationism attempted to argue the old straw about science being unreliable and incapable of offering certainty, therefore God. In doing so they betrayed their ignorance of what science is and how we know what we know.
To begin with science doesn't talk about absolutes, it talks about degrees of certainty. The short explanation of this is that certainty is defined by supporting evidence. The less evidence you have to support your idea, the less certainty we have that it's true. The more evidence you have, the greater the degree of certainty.
There are no absolutes when it comes to knowledge. We're always updating and refining our knowledge, but at this point we very rarely end up refuting something that has a great deal of evidence supporting it. Most of the ideas in science that get left behind are ones that didn't have that much evidence supporting them regardless of how popular they were. One such example is the Big Crunch hypothesis for how the universe will end. Current observations make that hypothesis extremely unlikely so cosmologists have a very low degree of certainty.
Creationism has no evidence supporting it. The conflation of creationism as a branch of science is a lie meant to comfort people who are emotionally invested in it. There's no evidence of a creator, no evidence that the universe was fully formed at its beginning or that a trickster god planted false evidence to lead us to believe that it's actually 13.8 billion years old (See: Last Thursdayism).
The "young earth scientists" out in the world aren't scientists. They're religious partisans who make no useful predictions, perform no repeatable experiments and devote the majority of their time either attempting to refute real science or creating apologetics for what current discoveries mean for their beliefs. What they do is not science. It's more accurately described as lying for Jesus.