Ephesians 4:30 And do not grieve the Holy Spirit of God, by whom you were sealed for the day of redemption.
Our inheritance as children of God through faith is secure. Even if we are faithless, He is faithful.
2 Timothy 2:12-13 ... if we endure, we will also reign with him; if we deny him, he also will deny us; if we are faithless, he remains faithful for he cannot deny himself.