It could be true that victory is tied to a mindset of divine providence. Yet even if so, if we're completely objective it remains unknown whether that means that divine providence exists and actually brings the victory; or that divine providence doesn't exist (in the way humans think of it, anyway) but the belief in divine providence brings the confident and sustained action that results in victory—making it seem, subjectively, exactly the same as divine providence guiding the victory.

Probably no one definitively knows which is true until after passing from this life, but how important is that? If you're living a happy, fulfilled life and getting the results you want while being charitable and loving, that's kind of the point of life. You're winning already, before the question of personal religious beliefs arises.

Seen this way, belief in divine providence takes on a no-lose proposition flavor. It either exists and helps you by inspiring you to do what it takes to succeed; or your belief in its existence helps you be the person who does what it takes to succeed.