I'd like for you to answer the following questions. The answers are to be based on your personal views alone. (Obviously, this question is aimed toward those who believe God exists.)
I'm not sure what the word 'God' means. I definitely don't believe in a Judeo-Christian-Islamic-style personal theistic God.
Interpreting the word to mean something more vague and philosophical like whatever the ultimate source, principle or explanation for being itself turns out to be, I'll say first off that I have no way of knowing whether there's just one of them. Monotheism can't just be assumed.
1)
Is God all-knowing?
Whatever the ultimate source/principle/explanation(s) is/are, I doubt very much whether it will turn out to be a person with a human-like psychology that knows things like we do.
2)
Is God all-powerful?
An explanation would have to have sufficient power or causal efficacy to accomplish whatever it is that it's being invoked to explain. But I have no way of knowing whether there are other things that it couldn't do.
I suspect that there probably is. There's that familiar old conundrum: Can God create a stone that's too heavy for God to lift? It would seem that God can't be omnipotent whether we answer yes or no to that one. More generally, does God have the power to do logically contradictory things?
3)
Does God intervene in our daily lives?
If God is whatever hypothetically accounts for being and for the laws/regularities of nature, then that's intervention of a sort, I guess. Does the universe's ultimate principle intervene in history Bible and Quran-style? I don't know of any convincing reason why I should believe that.
4)
Is God responsible for the creation of everything in existence?
I'd say yes, but only because I'm defining the word 'God' for the purposes of this answer to mean whatever it is accounts for everything in existence.
5)
Has God always existed?
Presumably God temporally preexisted the origin of the universe if we are using God to account for the initial origin of the universe. Beyond that, who knows? Even if God is temporally eternal, we are still going to need some account of why one or more of these eternal Gods exists and not no God (and hence no reality) at all. Like somebody wrote, it's apparently turtles all the way down and seems to suggest an infinite regress.
6)
Is God it's own individual being separate from humans?
Humans are an integral part of the universe and some people might opt for some kind of pantheism, I guess. That would make humanity into something like little fragments of God. But when I'm defining the word 'God' to refer to whatever it is that accounts for the universe, to equate the universe with God would suggest that the universe is self-explaining.
7)
Can God assume human form?
Humans are finite by their nature, whether cognitively, emotionally or physically. If God is supposed to be omniscient, omnipotent and omni-whatever, then that would seem to be inconsistent with humanity.
I'll even go further. Not only do I think that God probably can't take the form of a human incarnation-style here on earth, I'd strongly question whether God can have the psychological form of a person anywhere. People are fundamentally temporal, inextricably enmeshed in the flux of time and change. We perceive, we react, we learn, we decide, we act, all of it in time. I have trouble understanding how something that's supposed to be timeless and unchanging can still be meaningfully described as a person.
8)
Does God answer prayers?
I don't think so.
9)
Can God be in two physical locations at the same time?
I have no way of knowing. Is God even in one place? Where
is God supposed to be anyway?
10)
Does God communicate directly with you?
Not in any way that I'm consciously aware of.