It is reasonable to conclude that there would be marks left from such activity. There is no valid Biblical reason to assume that God would fix the surface of the Earth and you go much further, you tell us that he lied about what he did. You may not realize that you do make that claim, that is because you don't know how to use logic. Again, the Earth tells us that it has a history. It does not match that of the Noah's Ark Flood myth. That means that your version of God not only fixed the surface of the Earth, he went much much further than that. According to you he put a history, for no fathomable reason, that tells us there was no flood, there was no Adam and Eve. That means you have to believe in a lying God. Most Christians do not think that is reasonable.