It is when we step outside of what the tests actually tell us to make assumptions about the evidence that delusion becomes much easier to happen than when we limit our conclusions to only what the evidence tells us that testing is effective for knowing truth from delusion.
When examining The Theory of Evolution, we find evidence is not only misinterpreted, it's distorted, removed and changed at times. There is nothing wrong with science, but the scientific method is not complete unless you have the initial conditions to test. Since they don't, they guess at them and make assumptions.
But we are fallible humans. We cannot put the Bible or God through a scientific testing that has flaws.
"Sir Francis Bacon developed a method for philosophers to use in weighing the truthfulness of knowledge". This pertains to the studying of the natural world, not the supernatural. He wanted to study God's creation, he didn't devise some sort of testing God's Word. Micro-evolution seems to be implied in Genesis, where sin came into the world and distorted what was perfect. This is when diseases, bacteria, viruses became a curse - the earth was curses and therefore changed the composition of it. Organisms started to die and our days were numbered. Yet, God knew this would happen, so He input adaptive mechanisms into each organism, so that it could change to adapt to the environment. So these adaptive mechanisms would account for micro-evolution.
That said, distinguishing belief from delusion is sometimes complicated. Faith can't be tested by science. It's a supernatural gift. "Being sure of what we hope for and certain of what we of what we do not see", isn't exactly in the realm of scientific testing. "By faith we understand that the universe was formed by God's command, so that what is seen was not made out of what was visible."Heb.11:3
How can you distinguish faith from delusion? Since their are many religions and atheism (which is somewhat of a faith), how do you know which one is true? God confirms our faith through life and experiences. He communes with our spirit and we believe. But we also see the experiences of faithful people throughout history and where it led them. We see the faiths of Hinduism, Buddhism, Islam, and others and where the faith led them. Then we come to Christianity and where that faith has led the western civilization where it reached it's highest expressions of the fruit of the Spirit, knowledge, achievements, standard of living and prosperity in the United States. God surely blessed America like no other nation. Isn't that evidence? You can use that test with other faiths and very often find delusion, the wrong path, false god or lack of God, by just looking at their state. Does this country show blessings from God or does it express poverty, evil, selfish greed, and the lack of freedoms and simple joys of happiness that we so often take for granted?
Let's get down to business. Was Jesus the embodiment of truth? If so, then all the others were liars and false prophets.
If He was delusional, then it's all up for grabs. But then one could say, some other teacher is right and all the rest are wrong as well. Then you would have to examine the fruit of his and his follower's beliefs. If we are all wrong, and there are no absolutes (no truth), then we have a condition that many suffer today called Moral Relativism. It would be impossible to state that truth is relative.