I’ve heard god defined as ‘the inner world’, that which is within us. Which I think is a more sensible thought than god as some kind of invisible man-shaped creator in the sky.

nope. there are so many personal gods, and so many conceptions of god as something other than a personal god. i have encountered people who suggest that i am not really an atheist just because i don't believe in any personal gods, and that i really am quite spiritual because... because... well it gets murky there but they suggest that there is such beauty in nature, nature is a kind of god. i tell such people, we already have words for natural phenomenon, and there is no need to redefine a tree as god, or love as god, because that just confuses those real (if sometimes intangible) things with an imaginary humanoid in the sky. so you can define god as pretty much anything if you're in need of a god, but if it's not an omniscient, omnipotent living thing made in man's image, it probably already has another name.

g

p.s. you might think "how do you know you don't believe in it if you can't define it?" my answer: i am capable of not believing in a whole bunch of stuff at the same time. i don't believe in any gods and simultaneously don't believe in unicorns! (i'm so talented!) i am capable of not believing in zeus or baldur (but i kind of like baldur) while also not believing there is anything paranormal about a tree.

Either there never was a beginning or perhaps more likely what we perceive as infinities actually are simply aspects that we cannot remotely understand. We describe infinities yet we do not understand them. Perhaps they are merely totally imaginary and perhaps everything we believe to be real actually is not.

God is a metaphor that personifies the entirety of reality as an intelligent, supreme being.
The entirety of reality, it turns out, actually does exist, and if you notice, behaves suspiciously like the god character in ancient stories that were written thousands of years before the mental gymnastics of objective literalism was invented. Human brains are designed by evolution to personify, and attribute agency to, any forces that we perceive to affect our lives. That Evolution! It loves to play tricks on us.

A fictional character, with al poerful supernatural powers who is supposedly all knowing and all powerful and yet acts Inconsistently, impractically and irrationally and often with great ignorance in the stories that feature him.

A swear word uttered by someone who can't explain something.

Other than what's in the dictionary, no.

An imaginary being who created what we cannot imagine how to create and who in some unknown way(s) watches us individually at all times for unknown reasons.