Can you show me one instance where a Biblical writer said something on the order that each day of creation was a literal 24-hour day? The problem (for the Young Earth Creationists, anyway) is that you can't.
No, he wouldn't. I think that the Biblical writers fully understood that yom is a flexible word.
However, I also don't think that he would deceive earth's scientists by creating a galaxy 1 million light years away and then creating the light waves from that galaxy 99.9999% on the way to earth. Nor do I think that he would add an exta 100,000 layers of winter/summer ice to Greenland.