Unless you have God taking an active part early in the story, most will not expect his involvement. If an explanation is needed for why he is not more active in assisting the knight, you can go many different ways. I'm sure I can't think of all of them but they might range from something as simple as God allowing the knight to grow (which would not happen if all of his problems were solved divinely) to some internal conflict on the knight's part which puts him in a place where he can't access God's help ( lack of faith, failure to follow instructions, etc.) Obviously this would all depend on the character of your knight. I think Elizabeth Moon does a good job with this in her Paksenarrion books. There is some direct involvement by her (Paksenarrion's) god in a few places but for the most part she's on her own.