[Andrés]

You cannot measure the diameter of a hair with a measuring tape with lines every centimeter.
Different instruments must be used to measure different orders of magnitude, and every measure has an error interval.

Scientists know Radio-isotope dating is not an accurate measure and can only give an approximate result. They admit that, that is honest and gives more value to the result.

It's not a matter of faith to say "We estimate this rock is 10,000,000 y.o."

It would be a matter of faith it they said "It is written this rock was created 10,000,000 years ago.