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>>Please tell me how this process of adoption works.<<

Galatians 3:26 - For ye are all the children of God by faith in Christ Jesus.

Romans 8:14-19 - For as many as are led by the Spirit of God, they are the sons of God.

Here's another good one for your list: John 3. In the opening narrative of John 3, Jesus tells Nicodemus how man is to be born again... of water and Spirit. Following this discussion, Jesus immediately goes to baptize. Your Scripture quotes are correct but incomplete. They are proof quotes, not full thoughts. Faith leads to action in the Spirit of God to come to Baptism to be joined to God's Family in the New Covenant. Baptism in the name of God (Father, Son and Holy Spirit) is the process by which one is "adopted" into the Family of God. It is the beginning of life in Christ from which all else is possible. It is also the Sacrament of Initiation in the Church.

Proof quotes can only take you so far. Don't forget that the Devil and his demons know who Christ is... they believe He is the Son of God. What they don't do is take that knowledge of belief into action in service of God. Belief is an action word, it is not a mere knowledge of identity. Belief without action is dead. We follow Christ in what He has commanded us to do as His followers... prayer, fasting, almsgiving and the Eucharist. These are the things that Christ commanded in Scripture. You will find they are also the things the Apostles delivered to the Churches (1 Cor 11).