All science is tentative, based on interpretation of the evidence. Some science - most of classical mechanics, for example - is so well supported that it is essentially pointless to argue against the interpretation. Other science - say, the cosmology of the very early universe, or the RNA world hypothesis - is not well supported, or the evidence is incomplete and so open to differing interpretations.
This is where the space for debate is.
Science is supposed to establish reliable theories that explain the available evidence. What then happens its that the rest of us are supposed to take this information and decide how we should apply it to the world.
Unfortunately, there is a body of people that reject certain established scientific theories - young earth creationists reject most of evolution and cosmology, electric universe people reject standard models of cosmology, AGW denialists reject man-induced climate change, anti-vaccine groups reject the idea of vaccine immunisation.
A lot of people think they can argue against well establish science, rather than that at the frontiers of our knowledge. They do this not for scientific reasons, but due to their theological or political positions. They have tied themselves to a particular view of the world and it doesn't matter the evidence presented, they're going to maintain it.
Winston Churchill said a fanatic is one who can't change his mind and won't change the subject. I participate here mostly for my own edification. But I hope that every once in a while, I'll be able to run across someone who isn't like the fanatics and is open to the evidence.
Neither side is going to give ground. It bipolar. The theists will argue with the atheists. The EU people will argue with the physicists. The creationists will argue with, well, pretty much every branch of the physical sciences (the phrase "not even wrong" comes to mind) and most of the theists as well.
But, and its a big but, they all hope to influence the people in the middle. That's why a forum like this is important.