I will repost this explanation I gave to Bill just a few weeks ago. Not because if he reads it again he will understand it. But to demonstrate that this concept has already been explained to him and still he does not understand.
Let’s see if this analogy helps you understand what you are missing.
Imagine we have two scientists. Scientist One hypothesizes the existence of a force called “Gravity”. According to his hypothesis, if a rock is held above the ground then released, it will fall to the ground.
Scientist Two hypothesizes the existence of a force he calls “Schmavity.” According to his hypothesis, when the rock is released Shmavity will act on it in a random way such that it will either fall to the earth or be repelled up into the air.
They test their hypotheses by conducting one million trials. In every single one, the rock falls to the earth.
Scientist One says "I guess the data supports the existence of Gravity, and not of Schmavity.
Scientist Two replies "Not at all. According the my Schmavity Hypothesis, every time the rock is released, it could fall down to earth. And, every time, it did. So the data supports Schmavity just as strongly as it does Gravity.
Common descent is Gravity.
Creation is Schmavity.
Does that help?