See ,that is not "faith" in God, that is faith in your church
No where does the scripture tell us Baptism seals anyone with the Holy Spirit.. and there is no such thing as "confirmation " in the NT
It is our faith alone in Christ for our salvation that seals us.. your son has no "seal" if he has not trusted in Christ
And you also were included in Christ when you heard the message of truth, the gospel of your salvation. When you believed, you were marked in him with a seal, the promised Holy Spirit,(Eph1:13)
"Confirmation" is the anglicized word for chrismation -- to receive an anointing and the gifts of the Holy Spirit. It's clearly mentioned repeatedly in the New Testament. Anointing with oil was a tradition that also goes back to the Old Testament, but it wasn't completely fulfilled until the arrival of the Holy Spirit in the New.