All history books are full of accounts of bloodshed, torture and selfish acts by mankind. The history of the 20th century is no better. Recently, Bush and Blair both said that God told them to attack Iraq.
Man has invented many gods and used them as scapegoats for their barbaric actions. They have written many Holy books and claimed they were inspired to write them. Obviously we need to look beyond these self serving history books, if we are to make progress in our search for answers to the mystery of the universe.
There are spiritual paths that seek to explain the hidden forces behind mankinds actions. They don't insist that we accept the notion of a man styled deity shouting out instructions from the sky. Until we get past that man made concept of a god, debates like this will continue for infinitem.