A personal exploration of a possibility:
I guess everyone has their own ideas about who, or what, God is, at least everyone who is not an atheist. For a large part of my life, when I thought about God at all, the image that I had tended to be of a benign, bearded protector in long, flowing robes. This of course is just a view of his physical form, if he has one, or, rather, how we might perceive him. Throughout the ages this has been a popular view of Him in art. And of course, the Bible reinforces this idea when it says that God made man(kind) in his own image. Perhaps an imagined physical form actually helps us to believe but suppose we consider not how God might look but his nature.
Some religions, particularly those that worship, or have worshipped idols believe in multiple gods. Ancient Egyptian gods included Anubis, Osiris and Ra, the sun god. The ancient Greeks believed that Zeus was the king of gods, with a number of minor gods under him like Apollo and Poseidon, who were a couple of the better known, with names still recognised today.
I think that most religions of today believe in a single god or deity. Monotheistic religions include Christianity, Judaism, Islam, Hinduism, Sikhism, to name the most recognised; there are others. It is conceivable that, in at least some of these religions, it is the same god by a different name, In Christianity and Judaism we know it is the same god, the God of Abraham, but Jews do not believe in Jesus or the Trinity.
I am a Christian and I believe in God the Trinity; Father, Son and Holy Spirit. A Trinity suggests multiple beings, or entities, of which only Jesus was incarnated or ‘made man’. Whilst God in Trinity has multiple aspects, it is, I think, generally accepted that those three aspects share a single conciousness.
What if God were a collective, or hive, mind, where individual wills and conciousness could perhaps operate independently but in which the whole is greater than the sum of individual parts?
Once the possibility of a multiple being is extrapolated, does it then become plausible to any degree that, God is in fact a collective conciousness, perhaps made up of more than just three. What if God were the collective conciousness of, say, all the souls of people that are not incarnate?