If there is something you are unaware of, you can't know that you are unaware of it. For example, before discovering the Americas, people didn't know that it existed, but furthermore, they didn't know that they didn't know that it existed. The bolded portion is the important part, and that's where things get tricky. You can never know if there is something that you don't know because of this, no matter what, and no matter who you are.
God can't know if there is something that He is unaware of. Therefore, God cannot be omniscient, and no one can.
An illustration to try to make it more clear:
Imagine only having one sense, the sense of sight. You can't hear sounds, and there's no one to explain what "hearing" even is. Therefore you are unaware of sounds that exist, and you are unaware that you are unaware that sounds exist.
Whatever the ways there are for God to experience the existence He is in, such as sight, sound, touch, and whatever other metaphysical ways can be imagined, there can always be other ways that He is unaware of that would detect things that He is unaware of and He would be unaware of all of it.
This is not a refutation of God's existence, it is only a refutation of His omniscience. It is to show that omniscience is logically impossible. But to take it a step further, it is a falsity for the Bible to claim God is the only god because even God can't know that nor is there any way to calculate any probability that He is the only God that is, ever was, or ever will be.
*Disclaimer: I am not the author of this principle. I read it years ago on the internet and have no idea who did originate it. Searching for it again only shows scientific applications about particles and such. If anyone knows who wrote it, or finds who wrote it, I'll replace this disclaimer with the credit due.
God can't know if there is something that He is unaware of. Therefore, God cannot be omniscient, and no one can.
An illustration to try to make it more clear:
Imagine only having one sense, the sense of sight. You can't hear sounds, and there's no one to explain what "hearing" even is. Therefore you are unaware of sounds that exist, and you are unaware that you are unaware that sounds exist.
Whatever the ways there are for God to experience the existence He is in, such as sight, sound, touch, and whatever other metaphysical ways can be imagined, there can always be other ways that He is unaware of that would detect things that He is unaware of and He would be unaware of all of it.
This is not a refutation of God's existence, it is only a refutation of His omniscience. It is to show that omniscience is logically impossible. But to take it a step further, it is a falsity for the Bible to claim God is the only god because even God can't know that nor is there any way to calculate any probability that He is the only God that is, ever was, or ever will be.
*Disclaimer: I am not the author of this principle. I read it years ago on the internet and have no idea who did originate it. Searching for it again only shows scientific applications about particles and such. If anyone knows who wrote it, or finds who wrote it, I'll replace this disclaimer with the credit due.