CAPE TOWN, South Africa — A report by a Boston-based think tank said Tuesday that conservative U.S. Christian groups are setting up fronts in Africa to fight for anti-gay and anti-abortion legislation to promote their convictions.

The report accuses evangelical stars such as Pat Robertson and Rick Warren as well as Catholic and Mormon groups of setting up institutions and campaigns in Africa that are “fanning the flames of the culture wars over homosexuality and abortion by backing prominent African campaigners and political leaders.”