If I shake my fist at the sky and declare to God that I am impressed with neither his presence nor his proofs to date, and I challenge the aforementioned God to kill me now or forever be regarded and described by me as fictitious, does that prove anything?
Not really.
G-d is under no obligation to prove anything to you. It's kind of like you shaking your fist at me, and saying that you are not impressed with my existence.
My response would be something along the lines of.... "That's nice" and I move on.....
That much is all it would take, Bro.
And I seriously doubt that you would let it get to me shaking my fist at you in frustration over your lack of response. I imagine that you would jump right in at "Hey Bud..."
That much would prove your existence to me. I could then acknowledge your presence and offer to buy you a beer and see if you are worth spending any of my precious Time with.
Time is the only currency that the greedy can't hoard or manipulate. It MUST be spent wisely.
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I assume that you have seen at some point, those videos where the lady in the car is freaking out at a police officer that pulled her over. The lady, or guy, ends up tased, arrested, sometimes maced, and ends up going to jail.
I've been pulled over more than a few times in my life, some for speeding, some for things I thought were bad calls on the officers part.
In all cases, I responded to a "Yes Sir", and obeyed every command I was given, even if I thought the officer was incorrect in giving me a ticket. In all cases, I have never been tazed, never maced, never dragged out of my car, arrested or sent to jail.
Throughout life, how you approach people, makes a difference in how they respond. If you are freaking out at the cashier, they are less likely to give you a refund on your cold chicken nuggets.
When I worked at a Grocery store, I can remember one specific cashier, that their standard practice on a price lookup, depended on how the customer asked. If they asked in anger or frustration, or condescendingly, she would pick up the phone and call the manager. This would hold up the customer, and everyone behind them, until the manager came and did the price lookup.
If the customer asked pleasantly with politeness and courtesy, then the cashier will do the lookup herself, taking just a minute or two.
I would wager that if people came to you yourself, and asked for help on a matter, that you would also be less inclined to help if they asked in a demanding fashion, with an "I'm owed your help" attitude. Equally, I wager you would be more inclined to help, if they asked humbly, and politely with a "I know you don't have to, but I would appreciate it" attitude.
Now if you can understand that, at a human level... please apply that to G-d. You are not 'owed' a response. If you don't want to believe, it's all good with G-d. That's on you.
If you really, honestly, politely, wish that G-d will make himself known to you... I personally am a firm believer that G-d does answer honest people, asking honest questions. I firmly believe this. I know it's true, because G-d has responded to me at times in my life. I know he's there, and he is with me, and he will always be there. It's not even a debatable question in my life.
Now I don't know what is going on in your life, that led you to the point you are shaking your fist at G-d. We all have pain and suffering in our lives. Sometimes of our own making, and other times, from those around us.
But G-d didn't do that. This world is screwed up because of us, not him. So acting like we are owed something.... no we are not. None of us are.