That's a failing of humans, not of their belief system. One needs only point to such things as the sack of Jerusalem, the use of Shinto in WWII Japan, the Thirty Years War, the Spanish Inquisition or the current troubles in the Muslim word to show that people don't need atheism to "create any morality they feel like based on the needs of the moment." Theism can do just fine, if the people are so inclined.
Ahhhh...you miss the point.
Christianity provides an ultimate standard, doesn't it?
One needs only point to such things as the sack of Jerusalem, the use of Shinto in WWII Japan, the Thirty Years War, the Spanish Inquisition or the current troubles in the Muslim word to show that people don't need atheism to "create any morality they feel like based on the needs of the moment." Theism can do just fine, if the people are so inclined.
Not to mention that the Holocaust is a logical and historically consistent extension of the Inquisition.