With Ted Cruz clinging to a narrow lead in the fast-approaching Iowa caucuses, an increasingly vocal chorus of evangelical leaders and campaign rivals is questioning the authenticity of the candidate’s vaunted Christian faith by pointing to his reportedly meager record of charitable giving. In a series of interviews this week, political opponents and pastors alike suggested Cruz — an avowed Baptist who is aggressively courting evangelical voters — has flouted the Biblical commandment of tithing in his personal life.