This is a must read, so I'll include an excerpt to give you an idea of its contents:
On most of the standards for a just war, the invasion of Iraq was criminally unjust. Messrs. Wolfowitz, Cheney and Rumsfeld wanted to invade Iraq the day after the World Trade Center attack. They tried to persuade the people that Iraq was somehow involved in the attack. They insisted that the Iraqis possessed weapons of mass destruction. Their arguments for the war, we all know now, were not true.
There was, therefore,
no just cause, no attempt to exhaust all possible alternatives short of
war, no real hope for victory, no postwar plan, and no ability to
prevent the postwar butchery that was easily predictable to those who
understood Iraq. The war leaped from slogan to slogan -- weapons of
mass destruction, the critical front in the global war on terror, stay
the course, freedom and democracy in Iraq. All these slogans are false.
Check out the whole post, and reflect on what it means that the church in the US has predominantly either supported this war or remained silent.