Oxygen can damage us though. It can react with many different types of molecules. It can damage things like amino acids, proteins, and the nucleic acids. Which brings us to the next claim by Texas creationists.

Photo dissociation of water vapor has been a source of oxygen since the Earth formed, and there is substantial geologic evidence that a significant amount of oxygen existed in the atmosphere prior to the advent of photosynthesis. Oxygen breaks down amino acids and sugars that are postulated to have formed!