(Reuters) - Egypt's president and other Muslim leaders should demand the U.N. criminalize contempt of religion after the release of an anti-Islamic film and cartoons which demonstrate growing racism, said the leader of the biggest ultra-orthodox Islamist party. Despite doctrinal and political differences with President Mohamed Mursi's Muslim Brotherhood, the Salafist Nour Party played a key role in supporting it during presidential elections in June. Led by Emad Abdel Ghaffour, it now ranks as the second-largest party in parliament and plays a formidable force in Egypt's new politics. "We call for legislation or a resolution to criminalize contempt of Islam...