Khat, Floo has asked this question on a number of occasions (in fact she's done threads very like this, but with slightly different title wording, on a number of occasions). If, as you say, it is thought that he is omnipotent, why should he not choose to use human beings to talk to other human beings about him? Are you saying that you would believe in God if he was to appear in front of you and explain everything to you? If so, how would you know that it was God and not just some idea conjured up by a fevered mind?
Is that a question you ask fellow believers?
If someone tells you they" heard the voice of God last night", do you question their mind's hold on reality? If someone announces they have found "God" is your first reaction always one of scepticism?
Do you also believe that a fevered mind is why there are billions of people all over the world who worship a different god to the one you have chosen?
I'm 58 now and never in my life have I experienced a fevered mind. While not impossible, I'd say that the likelihood of me doing so is pretty remote. It doesn't say much for religion if your first response is that someone's encounter with the supreme cosmic mega being is just be the workings of a brain that's lost its anchor to reality. I guess questioning a person's sanity is what you do when you know their statements are ludicrous.
Yes, imagination is great. We can make up lies at will and cannot be dis-proven. "A talking goldfinch just flew out of my bible and landed on my knee. We carried on quite a conversation for 10 or so minutes."
I decided to give the bible another go so I opened it at a random page.
I was absolutely gobsmacked when a great crested newt suddenly appeared and fell into my lap.
I then had a truly inspirational conversation with the newt, who informed me that he was speaking on behalf of the Lord of Hosts and that I had been chosen to hear his new message.
As a believer, you have to seriously consider that I am 100% truthful in what I say.