First, Let me say that I disagree with your low view of baptism and the eucharist. Something real happens in the use of the sacraments either positive for the believer or negative for the unbeliever (Acts 22:16; 1 Cor. 11:29).
But you are correct regarding the wedding rite. The betrothed Christian couple, having obtained the permission of their parents and made a public announcement of their engagement, are considered husband and wife in the eyes of God. The wedding rite is both the public confirmation and a symbol of a lifelong union that has already occurred.
The wedding rite was developed by the NT church for the good and useful purpose of reminding us of what scripture teaches regarding the state of matrimony. It is not a sacrament as the Papists falsely teach.
