NEW YORK — Child-protection policies adopted by Roman Catholic leaders to curb clergy sex abuse in the United States are inconsistent and often worryingly incomplete, according to a think tank’s two-year investigation encompassing all 32 of the country’s archdioceses.The analysis by Philadelphia-based CHILD USA said the inconsistencies and gaps suggest a need for more detailed mandatory standards for addressing sexual abuse of children by priests and other church personnel, a problem that has beset the …