Creationism is reality. It is supported by the faultless recording of ancient fact. The half life decay of atoms and the speed of light are points without an initial point of reference, and there is no way to establish one objectively. Without objectivity there is no science, only politics.
None of what you said is true. A given quantity of matter is a finite number. The ration betweeen the radioactive atoms and their decay atoms are finite, measurable, and comparable to samples observed in deep space and deep time some billions of years earlier. These are obserrvable, objective, and measurable events.