The war in Iraq is not a Catholic vs. Protestant thing. I seriously doubt that there is any significant divergence of opinon regarding the war vis-a-vis Catholics and Protestants in the US.
Also, the war wasn’t started to “keep Israel safe”. The war was started to keep Iraq from developing and deploying weapons of mass destruction. In hindsight it is evident that the UN inspectors were doing an adequate job on that front but–and this is significant–everybody at the time believed that Iraq did possess WMDs…even the UN itself and nations that opposed the war such as France and Russia. At this time, the main reason to stay in Iraq is to avoid the chaos and genocide that would occur if we pulled out anytime soon. Those folks really, really hate each other.