As a Christian I fully believe in Christian values being used in dealing with injustice in the world.
However too often people in power use Christian (and other religions) messages and values to justify their actions and then proceed to manipulate them for their own not so righteous purposes.
There's always one major aspect of Christianity that's missing in these situations, and that is Compassion. Whether it's respect, tolerance, love, forgiveness or acceptance, service to others Compassion is hardly mentioned or enacted by leaders when using religion as a subtext in politics, conflicts and world affairs eg. Iraq, Middle East conflict.

Jimmy Carter:
"Christ was committed to compassion for the most destitute, poor, needy, and forgotten people in our society." taken from Alternet interview described below


Here're 2 fine interviews with prominent world figures who speak out against the misrepresentation of christian values in politics and world affairs and advocate for greater compassion for others.

An interview with Nobel Peace prize winner Desmond Tutu of South Africa. In it he speaks out on a range of topics like fundamentalism,the misuse of religion to stir conflicts, AIDS in his country, the re-election of GWBush and Iraq.

Another interview with former US president Jimmy Carter. He talks about the current ties between the Republican conservatives and christians and the decline of religious values from the Democrat party's main issues. He also gives his opinions on how he deals with the conflict of Democratic support for abortion and gay-rights with his own Christian values.