Abstract: Politicians, in legitimising their ideologies exploit language. They consciously produce specific kinds of speech acts in order to covertly authorise their beliefs and persuade their audience. A plethora of studies exist on propositional meanings in Nigerian political speeches nonetheless a paucity exists on utterance meanings in foreign political speeches and on discordant concept of Religion and politics. Therefore, this paper investigated the kinds of speech acts Obama employed in legitimising his ideology about religion in his 2006 political speech titled Faith and Politics.