If you read the old testament, you will soon come to realize that god was jealous because he hated his competition. This is interesting because he went to so much trouble to be the "one god" for Abraham and his "chosen" people.
Thousands of years later, though, billions of people believe it as gospel truth that there is one god and that it's always been that way.
As a side note, I also find it irritating and interesting that christians cherry pick so much of what they believe, and conveniently write off the rest of the bible, their one and only book. For example, exodus contains the 10 commandments. So they choose to follow those. And genesis contains the infamous beginnings of the universe and creation of man nonsense. They love that stuff too. But all the ridiculous and petty rules from leviticus are dismissed. Funny how that works.
But I digress.
There are 13 instances in the entire bible that say that there is only one god. Some of those are a bit weak, though. Like Deuteronomy 32:39 - See now that I, even I, am he, and there is no god with me.
When you have to go to the trouble to say you're the only god and you're alone, that just screams of really trying very hard to convince someone. A lot of the other quotes are in the same kind of vein.
Now, you might be wondering why I'd care if there were lots of gods or just one. I don't believe in any of them. But it matters to me in the sense that millions of people have been killed and tortured, wars have been waged, atrocities committed, and on and on, all in the name of the "one true god". To me, this is just another instance that shows the errancy of the bible, flawed because angry men in ancient, barbaric, superstitious times wrote them. There certainly is nothing divine or holy there.
In the old testament, there are 34 instances of gods in the plural sense. In the new testament, there are 2. Most of them are about how the people must follow the one god and ignore the rest. But, this begs the question, if god himself is telling you to ignore all the other gods, isn't that pretty much admitting that the other gods are there? No wonder he's jealous! He's totally insecure!
That makes sense, too. Because god didn't hold up his end of the bargain lots of times for the jews. He constantly went back on his word in the old testament. I have no idea why the jews didn't just get rid of him, considering how much he sucked, and still does. He certainly doesn't help them out. Oh wait, that's because he doesn't exist. Ok, never mind.
If you go back in time to ancient times, you'll find that people would worship just about anything if they superstitiously felt it helped them. The sun shone down upon me, let's worship it. That mountain seems strong and provided food for my goats, let's sacrifice a goat to it to say thanks. That cloud gave me rain, let's worship the clouds.
Then along came Abraham who decided to make a contract with one particular mountain god. That god was a complete jerk, making poor Abe almost kill his son as a test. But Abe thought he was going to be a good asset so he made a deal with him.
Now we're stuck with zillions of people believing this ancient desert god who is jealous, petty, angry, and childish is the one main god that has survived since that time. Thanks, but no thanks.
But with a bit of science and common sense, smart people can see that a mountain is just a mountain, that the sun is just a star, and that no evidence exists for any god. Not one shred.
To see all the god vs. gods quotes on one convenient page with links, go to my fav bible, The Skeptics Annotated bible.
By the way, sorry for the delay in posting. I had to reinstall windows on my computer as I was getting the blue screen of death. Never a fun process.