It's a test of personal faith, they don't have to proclaim it to others to 'pass the test'. They pass the test by having faith without proof. It depends on how

It's a test of personal faith, they don't have to proclaim it to others to 'pass the test'. They pass the test by having faith without proof. It depends on how they interpret the results to the customer. They might show the data and say that "it seems that this rock is million years old". They don't have to believe it themselves. If the customer is another creationist, they probably marvel the perfection of God's creation and how impeccably he has been able to fake the age of the universe. You know, they probably see it as an evidence of God's omnipotence.