Conversion results in adoption. Christians realize the effect of election and become children of God. The point is we belong to him. Philippians 2:14-15 is not saying the relationship to our heavenly Father is revocable. Adoption is permanent. Instead, it means when we conduct ourselves in all situations without grumbling or disputing (Phil 2:14), we show the world how a child of God is supposed to behave (Phil 2:15). Adoption brings us into a family with expectations. We are expected to be lights in a dark and crazy world. Joyful obedience proves that we get it.