Smith still felt that he had grokked rightly the human word "God" - the confusion had come from his own failure in selecting other human words.  The concept was truly so simple, so basic, so necessary that any nestling could have explained it perfectly - in Martian.  The problem, then, was to find human words that would let him speak rightly, make sure that he patterned them rightly to match in fullness how it would be said in his own people's language.