A Catholic school system in Massachusetts has issued a new policy that orders students to use their names and pronouns assigned at birth and to conduct themselves in a manner “consistent with their biological sex,” drawing criticism in the latest clash between religious leaders and proponents of gender and sexual fluidity. The policy will affect 21 Catholic schools and more than 5,000 students in Worcester, a city about 45 miles west of Boston, beginning in the fall semester, according to an Aug.