ikabod writes:
so , if faith has a given cause , then it is evidence for that cause
This can be (loosely) translated into the following syllogism:
P1: Faith is caused by God;
P2: Some people have faith;
C: Therefore, God exists.
If P1 and P2 are true then the conclusion is also true. But it is not at all clear that P1 is true. For all I know, fear, ignorance and certain mushrooms are all very good candidates for the cause of faith. What I am saying is that the cause of faith is not a given. The syllogism then becomes:
P1: Faith is caused by X;
P2: Some people have faith;
C: Therefore, X exists.
Thus, we are none the wiser about the nature of X. That faith has a cause says absolutely nothing about the nature of the cause, which is what you nevertheless seem to imply. In other words: of course faith has a cause, but I don't think it is the cause that you would like it to be.
"Ignorance more frequently begets confidence than does knowledge: it is those who know little, not those who know much, who so positively assert that this or that problem will never be solved by science." - Charles Darwin.