That wasn't what you claimed. You insinuated the Bible said the Earth was 6000 years old. Lord Kelvin's estimate of 30 million years was a radical step forward given the techniques available at the time. Radiometric dating did not exist until the 1950s. You're welcome to make the case all humans and all scientists were idiots prior to 1955.
The Bible says nothing about the age of the Earth. Some guy making interpretations is still just an interpretation.
The reason western civilization uniquely in the world developed the scientific method is because of monotheism. Christianity was the primary sponsor of science and scientific education for over a thousand years in the West. That's because of our particular brand of monotheism.
The Christian Bible is very legalistic, and for western natural philosophers it was not a big jump to go from a rational monotheistic moral law-giver, to a rational monotheistic natural law-giver. Christianity is premised on a rational personal creator that gave design and order to the moral and physical dimensions of the universe. Epistle to the Romans explicitly states that God is revealed in nature, aka God is revealed in the order and design of the universe.
^^ That backdrop is largely why experimental science and formal logic uniquely is rooted in the west. It didn't develop anywhere else. That Christian backdrop is a milieu that just begs for people to go looking for, and expect to find rational organization and natural laws.
That's why I do not get bent out of shape about religion and science. To some extent, they go hand in hand.