Why do you think the authors of those stories "plagiarized" what was commonly understood history? 

Did Plato plagiarize his account of Atlantis? No. He wrote down what he was told. 

Once a person starts to poke at things, I think it's more remarkable that the Bible shares a very remarkable similarity to all mythologies that I'm aware of, from the whole world over. So, I can't agree that the Bible is "plagiarized." 

As for the divine consciousness you believe responsible for our existence, why is it that you would reject the God of the Bible as that being? 

Religion is evil. I agree. The Bible certainly has been misused. I don't think I'm religious. Most organized religion (well, probably all) is certainly off the mark or just outright evil. But... That's still got nothing to do with God's purpose for humans and very specifically for you.