Just a nitpick - There is no such thing as 'State-sanctioned murder'.
Good point. Murder gets thrown around a lot, especially in abortion cases. Murder is a very specific legal definition. In law, execution is justifiable homicide.
Second- Where is your data to back up the claim that non-US Christians are more opposed to the death penalty?
I don't have the data at the moment, but I'm assuming it's based on the fact that most of the western world besides us does not have the death penalty. Now whether that's due to more secular populations in the rest of the western world, or merely due to our odd brand of fundamentalist/evangelical Christianity in the US, I don't know.
Edit: Found a list of countries without the Death penalty.
http://www.amnesty.org/en/death-penalty/abolitionist-and-retentionist-countries
Albania, Andorra, Angola, Argentina, Armenia, Australia, Austria, Azerbaijan, Belgium, Bhutan, Bosnia-Herzegovina, Bulgaria, Burundi, Cambodia, Canada, Cape Verde, Colombia, Cook Islands, Costa Rica, Cote D'Ivoire, Croatia, Cyprus, Czech Republic, Denmark, Djibouti, Dominican Republic, Ecuador, Estonia, Finland, France, Gabon, Georgia, Germany, Greece, Guinea-Bissau, Haiti, Holy See, Honduras, Hungary, Iceland, Ireland, Italy, Kiribati, Kyrgyzstan, Liechtenstein, Lithuania, Luxembourg, Macedonia, Malta, Marshall Islands, Mauritius, Mexico, Micronesia, Moldova, Monaco, Montenegro, Mozambique, Namibia, Nepal, Netherlands, New Zealand, Nicaragua, Niue, Norway, Palau, Panama, Paraguay, Philippines, Poland, Portugal, Romania, Rwanda, Samoa, San Marino, Sao Tome And Principe, Senegal, Serbia (including Kosovo), Seychelles, Slovakia, Slovenia, Solomon Islands, South Africa, Spain, Sweden, Switzerland, Timor-Leste, Togo, Turkey, Turkmenistan, Tuvalu, Ukraine, United Kingdom, Uruguay, Uzbekistan, Vanuatu, Venezuela
And this is countries with the death penalty for ordinary crimes:
Afghanistan, Antigua and Barbuda, Bahamas, Bahrain, Bangladesh, Barbados, Belarus, Belize, Botswana, Chad, China, Comoros, Democratic Republic of Congo, Cuba, Dominica, Egypt, Equatorial Guinea, Ethiopia, Guatemala, Guinea, Guyana, India, Indonesia, Iran, Iraq, Jamaica, Japan, Jordan, Kuwait, Lebanon, Lesotho, Libya, Malaysia, Mongolia, Nigeria, North Korea, Oman, Pakistan, Palestinian Authority, Qatar, Saint Kitts and Nevis, Saint Lucia, Saint Vincent and the Grenadines, Saudi Arabia, Sierra Leone, Singapore, Somalia, Sudan, Syria, Taiwan, Thailand, Trinidad And Tobago, Uganda, United Arab Emirates, United States Of America, Viet Nam, Yemen, Zimbabwe
Anyone notice a trend? While there are some exceptions in both categories, the overwhelming majority of the 1st world opposes the death penalty, while the overwhelming majority of the 3rd world supports it.