I Cor. 4:20 For the Kingdom of God is not just fancy talk; it is living by God's power.
Many people talk a good talk, but walk a poor walk. It's easy to claim to be who we are not. It is easy to be a "Christian" on Sunday and a non-Christian on Monday. No matter how much, or how well, we present the Gospel message, the important thing is how well we live it. God is not impressed by what we say and what we say won't sway Him when it comes to judging the heart.
Those who are truly children of God live what they proclaim. They are one in spirit with the Lord and allow Him to govern their lives. A child of God seeks to live better the Gospel message than he has before. He strives to not do anything that will dishonor the Lord. He will draw from the Lord the strength and power he needs for daily living. Holiness will be more than a word to him; it will be his way of life.
So few will make it into heaven who think they will make it simply because they are more talk than walk. Many will miss out on heaven who serve faithfully in the church. God judges the heart and if the heart is not right, what is done won't matter. He wants us to do what is right before Him and to serve Him well, with the right motives. If we do what we do out of love for Him and with the desire to honor and please Him, then we are indeed children of God.
You cannot be a child of God and by-pass Calvary or not let the Holy Spirit have control of your life.