We can use decision-making to choose the habits we want to form, use willpower to get the habit started, then — and this is the best part — we can allow the extraordinary power of habit to take over. At that point, we're free from the need to decide and the need to use willpower.
Having a Christian worldview shapes my decision-making with respect to all aspects of my life. I always respect people in public life who are principled, and those principles have to be connected to something. And my faith is what serves as the anchor and directs my actions.