Done by christians, consistent with violent teachings in the Bible, applicable to all christians and an example of christian culture, if one applies the same logic you used to develop your theory of islamic "culture".  There are many christian websites denying the involvement of Poles and other Europeans in the holocaust and WWII atrocities, as well as some denying the atrocities even occurred.  Virtually the only support for the death penalty in the USA is religion-based, predominately christian, based on the teachings of retribution in the name of God contained in the Bible.