The source of our belief, or non belief, must lie deep within our inner self (our soul if you like!).
Perhaps - if that were the case, though, it would seem to preclude people changing their opinion on that. If, as you seem to suggest, it's a matter of 'soul', then it's an intrinsic part of how we are made - why are some of us 'made' as unbelievers?
We either want to believe or we do not want to believe.
I don't see that belief is a matter of what you want - it's a conclusion you come to subconsciously.
For those who want to believe, there is abundant evidence for God to be discovered.
If the evidence only serves as evidence for those who want to belief, then I'd question the validity of the evidence - that sounds like blatant confirmation bias, to me.
My own faith grows daily - one lifetime is not enough to fully discover God.
How do you measure faith?
For those who do not want to believe, there will always be many reasons to choose from. The devil has them in abundance for those who wish to use them.
You appreciate, of course, that those of us who don't believe in gods don't believe in all the gods, 'the devil' included?
However there are some who did not want to believe, but have seen through the shallow logic of their reasons for not believing.
How is the logic 'shallow'? What does 'shallow' logic even mean? Something is either a logical deduction or it is not, there is no 'depth' to logic. You don't need a 'reason' for not believing, it's the natural state - we aren't born believing in anything, because we have no conception of anything to believe in. We are taught, based on geography and cultural surroundings, various ideas and put under various social pressures to accept unsubstantiated claims as valid - there's no 'depth' to that, it's a matter of circumstance which story you're exposed to at which points, and how credulous you might be at that point in your life.
O.