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Knowing you are a child of God should change the way you act.
Feeling in love doesn't take work. You're pushed along by emotions. But when you come down off the high, it takes intentional love to grow your marriage, and that takes work.
How can you know if she's "THE ONE"? First and foremost, ask yourself if your hearts beat together spiritually. If you're not in harmony is this area, you might want to reconsider moving forward in your relationship.
At the heart of the Christian marriage is the idea of Unity. God said the two should become one. Marriage is designed to satisfy that deep desire for intimacy.
Our mission is to make disciples. The best method to use is to love them.