In your opinion what causes christians to believe in Jesus

[Alan V]

But what I've personally always meant by free will, the altogether more reductionistic view, is that ultimately both the bottom up and the top down functions in the brain are enacted via the same physical mechanisms, eg neurons. Different areas of the brain may have different functions relative to each other, but they are all achieved through the same physical mechanisms, which follow the laws of physics and thus, barring quantum effects, are determined in my view, and thus cannot be considered 'free'.

I don't think we have to appeal to quantum mechanics to acknowledge free will in human brains, just to the processing of information. We generate our own information, and respond to it just as readily, if not more so, than to any external stimuli. We are, in fact, constantly talking to ourselves: describing realities, abstracting ideas, modeling possible responses, and assessing outcomes. Somehow that is all done within the laws of physics, but I can only think it is because new properties operating by new rules emerged as life evolved.