I do think that personality traits can have an impact on decisions, but I don't think it is a large impact at all. Taking a step back, do we really have defined personality traits? I can think of times in my life where my personality was vastly different that it is now. I think that free will is what changes your personality, even if only by a small amount. To me free will doesn't mean that you have two ( or more ) choices in front of you in which each choice has an equal chance of being selected. It could be that choice one has a 99% chance of being selected and choice two is only at 1%. You still have the choice. I can think of times where I did something that didn't fit my personality. And as far as religion goes I haven't always chosen to believe in Jesus, in fact most of the time I chose not to even though I had plenty of reasons to believe. But by free will I changed my mindset.
Basically I am saying that I think free will can be found in the ability to go against what is comfortable to your personality.
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