It is a loving of God primarily. There is no saving faith in God apart from a love for God.
Romans 8:28: "And we know that for those who love God all things work together for good, for those who are called according to his purpose."
Notice the connection those who love God are the ones who are called according to his purpose. Those aren’t two distinct categories. If you are called by God (thus saved) you love God.
I would just like to urge everyone to ponder their faith. We all need to test ourselves to see that our are love for God is true, not like the sad story in Matthew 7:20-23:
So then, you will know them by their fruits. "Not everyone who says to Me, 'Lord, Lord,' will enter the kingdom of heaven, but he who does the will of My Father who is in heaven will enter. Many will say to Me on that day, 'Lord, Lord, did we not prophesy in Your name, and in Your name cast out demons, and in Your name perform many miracles?' And then I will declare to them, 'I never knew you; DEPART FROM ME, YOU WHO PRACTICE LAWLESSNESS.'How do we know this is not about us? It is by our fruits, by our love for God that we can see our election. If our fruit is scarce test it to see that it does not taste of self love for personal gratification in heaven, but that it longs for deeper satisfying union with the creator. If we believe we all need to repent. Even the best Christian’s do not savor God’s precious goodness enough.
As Psalm 63:3 puts it: "Because your love is better than life, my lips will glorify you."
Ponder that God's love is better than life. Search deeply and diligently to see its truth.