House Republicans who have led a nearly two-year investigation into a $500,000 State Department grant to an organization that promotes humanism and secularism are pressing the agency to conduct more diligent oversight after it admitted that the organization may have misused taxpayer funds.Rep. Mike McCaul, a Texas Republican who chairs the House Foreign Affairs Committee, and Chris Smith, a New Jersey Republican who heads the panel’s human rights subcommittee, have accused the State Department of trying to promote atheism overseas under the guise of advancing religious pluralism, a longtime U.S. foreign policy priority. Rep. Brian Mast, a Florida Republican who...