It's difficult enough without muddying the issue with religion.即使不把宗教牵扯进去, 这个问题也已经够棘手的了。

the mixed motives that muddied Mr Crane's efforts使克兰先生的努力变得难以理解的复杂动机

They keep on muddying the waters by raising other political issues.他们不停地提出其他政治问题, 力图把水搅浑。