The reason why for the decline is because of the hypocrisy that Christians commit daily in the name if their deity.
Aaron is correct that Christians still kill in the name of your deity in African Nations and would gladly execute Gays in a heartbeat.
So as you sit there writing about reporting someone, please note Christianity has a bloody history and even in today's times many of it's followers would have no issues with genocide as long as it was done in the name of their deity.
As for your comment about Communist Nations, well it is true they have committed mass genocide in the name of their government and no one should deny it but it does not erase the blood that has been spilled by Abrahams Tribes for over two thousand years.
Now report me!