I think that this is the reason that some churches have introduced the sacrament of Confirmation.
Baptism is often performed with no teachings - for example on babies.
Confirmation supposedly comes with the whole package - teachings, the Holy Spirit, fire etc
Some churches only administered the mass or eucharist to confirmed members and some still do.
Whereu, confirmation is coming from biblical passages such as these, but you are basically correct confirmation is an initiation into Christian life.
The sacrament of confirmation is found in Bible passages such as Acts 8:14–17, 9:17, 19:6, and Hebrews 6:2, which speak of a laying on of hands for the purpose of bestowing the Holy Spirit.
Hebrews 6:2 is especially important because it is not a narrative account of how confirmation was given and, thus, cannot be dismissed by those who reject the sacrament as something unique to the apostolic age. In fact, the passage refers to confirmation as one of Christianity’s basic teachings, which is to be expected since confirmation, like baptism, is a sacrament of initiation into the Christian life.
We read: “Therefore let us leave the elementary teachings of Christ and go on to maturity, not laying again the foundation of repentance from acts that lead to death, and of faith in God, instruction about baptisms, the laying on of hands, the resurrection of the dead, and eternal judgment” (Heb. 6:1–2).
Notice how in this passage we are walked through the successive stages of the Christian journey—repentance, faith, baptism, confirmation, resurrection, and judgment. This passage encapsulates the Christian’s journey toward heaven and gives what theologians call the order of salvation or the ordo salutis. It well qualifies as “the elementary teachings” of the Christian faith.
