Believers who have repented of their sins and confessed faith in Christ are Biblically qualified to be baptized. All Christians are called saints. Christening not in Bible, nor godfather or godmother. Original sin not taught in Bible. No act or deed or guilt for such can be transmitted from one person to another.
Children are innocent until they themselves sin by their own lust.
The child does not bear the guilt of his father or anyone else, though he may suffer the consequences of others' sins. The Holy Spirit is given when a believer is immersed. Only Christ prayed for Holy Spirit to be sent. Holy Eucharist 1. He was not literally a vine or a door.