Well, as the saying goes, Assumption is the mother of all...well, you know the rest (forum rules and all that).
That is why when we do science, we use hypotheses instead. And an essential part of a hypothesis is that it has to be falsifiable. Which means that it must make predictions. Predictions that we can later control for correctness. That is basically how science works. It progresses by eliminating the hypotheses that doesn't work and keeping those that do.
That is why we have been asking the Creationists in this tread for two things: A working hypothesis and, in turn, evidence. Without those things you're not doing science. It's as simple as that.