Knowledge is belief. But that aside both people believe.
That's not necessarily true, George.
Knowledge can indeed often lead to belief.
Belief, on the other hand, don't require knowledge. It can, but knowledge is not essential to "believing".
And there are differences between "knowing" and "believing".
Belief can fall under two categories:
- Justified belief
- Unjustified belief
Justified belief can be questioned and tested, hence knowledge.
Unjustified belief relies on conviction without evidences, in another word, it is called FAITH. That's what believing in unjustified belief is: faith.
You can believe in gods and demons, heaven and hell, in miracles and the afterlife, but all of these rely on faith-based belief, and such a belief is more akin to wishes, fantasies and superstitions.
Knowledge on the other hand, rely not on just belief and faith alone.
Knowledge, real knowledge, like those acquired in science, can be questioned and tested, and depending on if the tests are successful or unsuccessful, the knowledge is either verified or refuted.
This is why in science, you don't perform one test only. You test a statement (theory or hypothesis) as many times as you can and as rigorously as you can, and you would allow for other scientists to independently test your statement as many times as they can (peer review).
More the tests you have performed, the more certain you can be if your statement can be verified or refuted.
I think religious people, particularly creationism forget that science is not about "absolute" because any statement (be they "theory" or untested "hypothesis") can be questioned, challenged and tested again. And that the x-number of tests determined if the statement is probable true (verified) or probable false (refuted).
Science is about probability, not about it being "absolute".
There is another reason why for performing so many tests, is too weed out any error or any anomaly. For instance, the error could be possibly be a faulty measuring device, like multimeter that won't calibrate properly.
New evidences can make existing theory obsolete.
When it come to dealing with astronomy, Newton's theory on motions of bodies and on gravity become dated and almost obsolete, especially with objects or particles that can approach the speed of light. This is where Einstein's theory on General Relativity comes in handy, replacing Newton's theory.
Newton's theory is also useless in object smaller than the atom, where quantum particles required different understanding of how they work.
So Relativity and Quantum Physics challenged classical physics, like Newton's theory on gravity and motion.
That's not to say Newton's theory is now obsolete; it isn't. Newton's theory just have limitations, and of no use in space or in the quantum world of quarks, leptons or Higgs bosons.
Can you test a god? Can you test resurrection?