CAIRO, EGYPT (DEC. 17) UPI - Saddam Hussein appears to be losing the battle to portray himself as a champion of Islam, despite the recent appointment of a Shiite Moslem defense minister. After ordering his tanks into Kuwait four months ago, the Iraqi leader made an appeal for support on the basis of Islamic values and concern for Islam's two most sacred sites, which are situated in Saudi Arabia. Reports in some Arab newspapers said the appeal was going so badly, the Iraqi leader last week appointed as defense minister Shiite Moslem Gen. Saadi Toamma Abbas. This was apparently done to appease the Shiite majority of his own country as well as neighboring Shiite theocracy Iran. Iraq is ruled by a Sunni Moslem minority. Islamic leaders in neighboring Arab countries and the wider Moslem world have failed to respond to the Iraqi leader's call for a Jihad, or holy war, against the West. Even Shiite Moslem fundamentalists in Iran, which from 1980 to 1988 warred with Iraq, have shown no inclination to support Saddam's cause on religious grounds, though the Iranians have condemned the presence of non-Moslem troops in the gulf region. "The secular and repressive nature of Saddam's Baathist regime is proof that the Iraqi leader is the last person entitled to call for a Jihad," said a recent commentary on Cairo Radio. Egyptian and other Arab secular intellectuals point out that Islamic principles have never determined Saddam's foreign policy in the past. Islamic leaders in fact perceive his attempt to use Islam to justify the invasion of one Moslem Arab state by another as a flagrant breach of Islamic values. In strict Islamic terms, Saddam as a secular leader is not entitled to call for a Jihad. Only an Alim or senior Moslem figure has the authority to do so. And the founders of the Baath party - which Saddam subscribes to - were a Christian, Michel Aflaq, and a secularist, Salah ed Din Bitar. That is not to say that Saddam has not tried in the past to exploit Islam for his own political ends. During the 1980-88 Iran-Iraq war, for instance, Saddam defended himself against Iranian accusations of atheism by making well-publicized visits to Shiite shrines at Najaf and Kerbala, using more Islamic terminology and symbolism in his speeches and building more mosques. But Saddam's own lifestyle contrasts sharply with Islamic tenets, according to Egyptian newspapers. The papers say he drinks, enjoys expensive Western suits and cars, and, though married for 30 years, has a long-term relationship with the former wife of the chairman of Iraqi Airways. In addition, the Baathist regime's lack of legitimacy has pushed Saddam into a cult of personality and purges that have also included Moslem clerics. Saddam ordered the execution in May 1980 of leading Iraqi Shiite cleric Mohammed Baqir Sadr and members of his family for alleged involvement in anti-government activity. A number of conservative Islamic thinkers have condemned Saddam for filling Iraqi mosques with posters and pictures of himself, pointing out that Islam forbids images in mosques. But perhaps Saddam's most spectacular failure has been his inability to convince even his most ardent supporters of his claim to be descended from the prophet Mohammad, the founder of Islam. "His supporters in Iraq are unlikely to admit it, but Saddam's claim to be a lineal descendant of the Prophet and of Ali, the fourth Caliph, and also that he is related to the former Hashemite royal family of Iraq, is not taken very seriously," said one Cairo-based Iraqi dissident. In addition to claiming descent from the prophet Mohammad, Saddam has also identified himself with Iraq's pre-Islamic and pagan rulers and is having the ruins of Babylon rebuilt at great expense, with every fourth brick inscribed with his name.