Does God exist?

"God"... Perhaps more literature has been written about this one topic than all the rest combined; and yet, it remains as unfathomable and unresolved as ever. What Grand Unified Theory is to Science, possibly the existence of God is to religions.
So, does God exist? No one knows for sure, but using the 'learning from first principles' approach of Elon Musk, we can put forward some possible answers to this question...
Poss A. No, God does not exist. He/She does not exist in any form, in any way imaginable. The creation, maintenance, and death of this universe does not involve any sentient authority. It all works as per laws of science.
Poss B. Yes, God exists, and He/She exists as...
-- Described by one particular religion OR
-- As a combination of postulates by multiple religions
-- Who knows... All the Gods exist in all the forms described by all the religions, each one mutually exclusive and presiding over their individual domains.

Poss C. Yes, God exists, but not as described by any of the religions or by others. All of them have got Him wrong. He/She exists in a manner that's never been thought of before. So far, we have not grasped it, but our understanding will eventually evolve over the next centuries... Or, the secret may be shared with us by aliens. That will be like Science achieving GUT... Or, perhaps both are actually the same thing.

Personally... I often find myself moving towards Poss D: We will NEVER know, and that's what actually constitutes it. Consider that in the ancient times, our ancestors considered all natural phenomena, the thunderstorms, the floods, the famines, the volcanic eruptions, even the rains to be acts of God. But over the millennia, we have understood, and in some cases even mastered, many of these, thus removing the God factor. But a huge many things still remain unknown, and I believe they will always remain, which will continue to push us to a better understanding of the Universe. God, in this sense, means the
Unknown. There will be no Final Answer to this Last Question.

Ship of Theseus

Any discussion about intelligence, mind and thoughts inevitably lands in the realm of Philosophy, an area I had considered to be rather unfathomable. However, recent reading has shown it to be full of interesting concepts; one of them is Ship of Theseus.
Consider this: A ship is anchored in a port for many years, being preserved as a war memorial. Over a period of time, its wooden planks are rotten by seawater and weather, so they are replaced one by one.
Eventually, all the structure of the ship is made of new planks.
Question is: Is it still the same ship? If the answer is "No", the next question is: At what point did the ship transform from old to new?
This riddle, originally posed thousands of years ago by Greek philosopher Plutarch, still presents itself to us in many forms. A knife, whose blade and handle has been replaced over a period, is still the same knife? Cells in the human body are continuously replaced by new ones, so after a few years, all the cells in our body are 'new', and yet, we continue to be same person

The Chinese Room

Most of us are familiar with, or at least aware of, the Turing Test. Simply stated, a computer program is said to have passed this Test if a person interacting with it cannot determine if he/she is conversing with a human or a machine. 
Recently, I came across a more intriguing test: The Chinese Room. Consider this: There is a closed room, which has a computer running a software program. We, humans, interact with the program only through a input/output terminal. We input questions or sentences in English, the computer program analyzes them, creates its answers/responses, converts them to Chinese and sends to us through output terminal. If the program is really good, we will not know if we are conversing with a computer or a Chinese person in the room. The machine passes Turing Test.
Now, suppose there is a person in the room equipped with the printed version of the same program. He does not understand Chinese. Again, we pass on questions to him through input. Using instructions from program, the person converts answers to Chinese symbols and gives them out through the output. Again, this setup would pass the Turing test... And yet, the fact remains that the person doesn't know Chinese at all, and all he is doing is converting symbols, the same task that the software program did before. 
This thought experiment raises several interesting questions: In this scenario, can the program be considered to have same mind as that of the person in the room? Does the program or the non-Chinese speaking person 'understand' the conversation, as we humans would do? This is similar to the question that Garry Kasparov has repeatedly asked about Deep Blue. The supercomputer may have defeated the Grandmaster, but does it 'understand' Chess?