Someone please justify my belief in free will

Firstly I was wondering how many of you believe that humans have free will.

I believe we do, but this seems to be unjustifiable.  Whether approached from a theistic or atheistic point of view, free will seems unable to exist thanks to an omniscient omnipotent creater and/or the unbreakable laws of physics.  Which leads me to

 Secondly, if yes, how do you justify such belief?

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