A child of God is anyone who accepts Jesus Christ as their Savior and Lord. When we do that, our sins are forgiven and we become a new creation. We are filled with God’s light and where there is light, there can be no darkness. Does this mean that if we sin or fail that we are no longer God’s children? Not at all, each of us will fail at times. The question is not about a single sin, but a lifestyle of sin. If our salvation experience does not change our lifestyle then we need to question whether it was a real life-changing event or merely an emotional experience that we had. Don’t be deceived, God is faithful and just. Getting saved is a rational, logical experience. There may be emotions and feelings involved, but the true experience is a decision that we make to trust our souls and our future to Jesus. If we have done this, then there will be changes in our lifestyle. Some immediately, some as we mature in our walk with Christ. Our lives will bear the fruit of the Spirit.