说起来很简单，因为这个"the"词根来自Greek的"Theos" meaning "God"，所以如此。

但实际上这个词根的应用范围远远不仅限于神学。我们说theory(Greek: theoria)，实际也与theology同源，它有如下含义（出自wikipedia）："Within Eastern Orthodox theology it refers to the state of illumination in which one becomes aware of God on the path to theosis where one beholds God face to face."也就是说今天西方“理性”的根源事实上出自对神的信仰，至少在词源意义上可以这么说。