God knows who are His

The question becomes when a person say: "I am a believer in Christ" and practice what God calls it sin is where God will meet this person in the core, in the heart. This is between God and the believer. Anyone can claim to be a Christian and only God knows who are His. Acts 15:8 God, who knows the heart, showed that He accepted them by giving the Holy Spirit to them, just as He did to us. 1 John 4:12-14 No one has seen God at any time. If we love one another, God abides in us, and His love has been perfected in us. By this we know that we abide in Him, and He in us, because He has given us of His Spirit. 2 Timothy 2:19 Nevertheless, God's solid foundation stands firm, sealed with this inscription:"The Lord knows those who are His"' Numbers 16:5 "In the morning the LORD will show who belongs to Him and who is holy, and He will have that person come near Him. The man He chooses He will cause to come near Him."