There are many similarities to the story of genesis and the creation story of the Assyrians and mesopotamians, who historians believe were some of the first civilizations to come about. Mesopotamia is also where many think the garden of Eden was.
In other words, there is a thread of Truth that runs through all religions.
For example, in my files somewhere I have a piece of paper oultining the principle of the Golden Rule in 12 religious traditions. This is one point of commonality.