I'll show you mine if you'll show me yours.

God is a concept invented by man to explain things they couldn't understand.

A god is whatever the believer believes it is. Anything and everything or nothing at all...

Let me stop you right there........most of us on here do not spend much time trying to describe unicorns, postulate what they might have eaten or enjoyed, either.......

Imaginary

Firstly and most importantly, it is a human made concept. No other species, Flora or Fauna, give two hoots about deities. Only us.
Secondly, if we had two children growing up in isolation, I very much doubt that they would come up with a concept of "god" on their own. If we did not indoctrinate the next generation into a belief of "god", the concept would disappear from human society.

Other than that, who cares what people think.........as long as it does not affect other life adversely.

NB As for the big questions; I go Buddha, accepting of "Just is"

God is a meaningless term, which enables it to mean anything anyone wants it to.

Which is why it is popular, who would want a god that did not totally agree with you ?

You want a metaphorical synonym for the first cause, God.
A personal imaginary friend, God.
A metaphor for collective thinking, God.
A way to say you have a relationship with a mystery (sic), God.
But above all, if you want an unchallengeable authority, who is always on your side in every political and moral debate, God.

(The last is especially good if you are an idiot, who likes to believe some weird stuff, like. "Red haired people eat babies." )

Spinoza's God is akin, or perhaps plays its role in modern times to give us the philosophical spaghetti monster sky God construct without understanding the information of new testiment that explains better what a biblical style god is when viewing wherewithal of both old and new testiments.

Spinoza's God gives us his Jewish ancestry Old testiment view of "most high" thing in existence. (Psalms 82:6).

Where as we can see Spinoza and most Jewish do not accept new testiment to see witness statements explain that the meme organism of old testiment evolved into flesh as Jesus.

In new testiment we have understanding that "god" is a title for top position, meme organism is biological nature for Jesus.

See my group "Illogical atheists guide for ending Christianity "

Very well established historically, in modern usage AND documented in dictionary that people are gods.

laws for the nation of Israel 2000 years ago recognized their citizens as gods. Jesus answered them, “Is it not written in your Law, ‘I have said you are “gods"’? John 10:34

Tep 10 Ultimate Rock Gods of All Time. [forum.songfacts.com]

List of people who have been considered deities

[en.m.wikipedia.org]

And, dictionary of modern usage shows. Bankers. Daniel Boone and Kit Carson as gods in their respective categories. See picture attached.

God
3. an adored, admired, or influential person.
"he has little time for the fashion victims for whom he is a god"

People like Richard Dawkins, Sam Harris, Daniel Dennett, Christopher Hitchens are gods of illogical atheism.

These gods of illogical atheism are gods because they are at top of hierarchy for illogical atheist in that they are very popular, influential and highly revered among other illogical atheist.