It is not the believer's mind which is closed.
This isn't my experience. Of course many believers are open-minded about many things but remain stubbornly closed-minded on subjects that relate to their faith. You are a prime example of somebody with a totally closed mind on the subject of 'free will' to the extent that you seem terrified to even learn enough about deductive logic to understand the fallacies you keep using or how to construct valid arguments - despite numerous claims about having 'sound logic' (which means both valid and based on true premises).
Are you able to open your mind to the possibility of the supernatural - things which are beyond natural scientific explanation?
To the
possibility, of course. That doesn't mean that I see the slightest reason to take suggestions about it seriously, i.e. to regard them as at all
probable.
If not you will find there are many missing pieces to the jigsaw of life.
Nobody knows everything and not knowing is far better than believing in baseless fantasies.
I know your view that opening up to such possibility can lead to all sorts of man made imaginary scenarios.
But the means to seek the truth is not to be led by your own imagination or what you want to believe.
It seems to be exactly the case for you. Your 'arguments' here seem to be based on nothing at all but what you desperately want to (continue to) believe. Of course you have (like most people) mainly latched on to other people's imaginations that have built a story over history.
Just try a sincere prayer to allow God to to lead you to the truth.
You will know the truth when you find it.
And be prepared to be surprised by joy.
This is a recipe for self-deception rather than a path to truth. For a start, which god? If you 'sincerely pray' and have some sort of emotional reaction (because you really want it to be real), you will clearly associate it with whatever god you had in mind at the time.
If somebody prays in a in a detached way, just to see what happens, and then says nothing did, the believers tend to come back with a
no true Scotsman fallacy: you obviously weren't being sincere enough.
Basically, if you really want to believe something and you try really, really try to do so, you may well succeed -
if you're prepared to give up on all those pesky things like objective evidence and sound reasoning and, especially in the case of most forms of Christianity, are prepared to turn a blind eye to the glaring contradictions.