Hi Shawn,
What Is "Faith"? "Faith is the assured expectation of thing hoped for,
the evident demonstration of realities though not beheld." Hebrews 11:1, NWT)
You reasoned, "You don't ‘just know’ the sun is coming up (tomorrow morning). You know it because it has been proven through science that it is there, and the world is spinning, so as long as the world does not stop spinning, we will see the sun ‘rise’ (tomorrow).
I notice that you are using the exact same reasoning that Paul used in Hebrews 11:1 in his definition of "faith." You both agree that in order to be able to confidently believe in something we have not seen (like the sun rising tomorrow morning) we must have sufficient reliable evidence first. The King James Bible refers to "the evidence of things not seen." The NWT renders it, "the evident demonstration of reality though not beheld." You referred to such evidence as "proven through science."
The point is that the reason why we can have "the assured expectation" (i.e. "faith") that the sun will come up tomorrow morning is because as far as we know it has always come up every day in the past. In this case there is so much reliable evidence to base such a faith on that we don’t normally think of such a belief as "faith." We just think it is the only reasonable conclusion to come to.
But according to Hebrews 11:1such a confident belief about something that is expected to happen tomorrow morning is "faith." We can say that we believe that the sun will rise tomorrow morning. But according to the above definition we could also say, "We have faith that the sun will rise tomorrow morning." Those who know the right evidence will even have faith in the exact time it will begin to rise.
Such a belief is not based on faith. Rather their faith (i.e. "assured expectation") is based on an understanding of massive amount of established scientific fact or evidence.
Another example I think of has to do with the astronauts and their space shuttle. They obviously must have "the assured expectation" that they are going to survive their trip. How can they have so much confidence in such a dangerous mission? I’m sure they can list tons of scientific evidence they have based their faith on.
Later you asked:
Where is faith needed if there is evidence or even proof available?"
Paul said that faith is needed only when dealing with things "not seen" and that in order to believe such things there must be "evidence or even proof available" first. Without the evidence or proof then such beliefs will likely lead to disappointment.
You concluded: "I'm pretty sure no one thinks that belief in the sun requires faith. The sun is observable with more than one of our senses. One does not need faith to believe in the sun."
Again, according to Hebrews 11:1 "faith" is only necessary to believe in things that cannot be seen. Therefore faith is not necessary for "belief in the sun" because, as you said, "the sun is observable with more than one of our senses." Faith is not necessary to believe that the sun exists or that it came up this morning because we saw it come up this morning. But faith is necessary in order to believe that it will come up tomorrow morning.
This is the way I understand the faith that Paul was referring to.
Don Cameron
P.S. Shawn: Did you see my thank you note for the "then" and "than" lesson you gave me?