How to disprove free will using basic logic

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Dr.Grass said:

You are assuming that the human brain is the source of a man's consciousness.

I understand that this is the general idea as accepted by our 'modern academics', but there is zero proof for this hypothesis. At least there is no more proof than there is for a supreme creator.

There is not even an indication that AI can be created. There is not a single shred of evidence. No-one would even know where to start. 

I have absolutely no problem with you believing that humans have souls (or anything similar), just so you know.