Buford Arning, a retired building-supply executive in Statesville, N.C., went to church each week until a pinched nerve made it hard for him to leave his house. He believes in living a faith-filled life. But he does not demand piety of his preferred presidential candidate, Donald J. Trump. “Am I a Bible toter that gets out and preaches on the side of the street and tries to convert everybody? No,†said Mr. Arning, 62, who calls himself an evangelical voter. He said he believed that Mr. Trump was “a Christian man,†and that was good enough. Mr. Trump may not...