Yes, it was. But there are fictional and non-fictional books. For those who regard the Bible as non-fictional, the text was composed by men, but the message behind it wasn't made up by men. But even if you regard it as all fictional and "men-made", one thing is for sure: the Earth wasn't made by men, there is inevitably a force involved man cannot control (whether it is just physics or God), and mankind shouldn't feel too much being in the control seat.