GOD COMES TO MEET MAN
50 By natural reason man can know God with certainty, on the basis of his works. But there is another order of knowledge, which man cannot possibly arrive at by his own powers: the order of divine Revelation.1 Through an utterly free decision, God has revealed himself and given himself to man. This he does by revealing the mystery, his plan of loving goodness, formed from all eternity in Christ, for the benefit of all men. God has fully revealed this plan by sending us his beloved Son, our Lord Jesus Christ, and the Holy Spirit.
By natural reason we can certainly know that there must be a God for the marbles of the universe, the material world, its works, its orderly laws cannot have existed from nothing to something by a mere senseless or unsound act. So man is able to worship God with his natural religiosity. However, this knowledge is not enough in order to worship the one true God correctly, for man creates his own gods or have his own opinion of how God is or of how He is to be worshiped. Therefore, in His infinite wisdom, God has decided to reveal Himself to men (this is what we call "Divine Revelation") so that we can worship Him correctly and be in the right path to salvation. Divine Revelation is Sacred Tradition, Sacred Scripture (the Sacred Deposit of Faith) which the Magisterium of Jesus' Church, the Catholic Church, has the gift to interpret and teach correctly.
THE REVELATION OF GOD
I. God Reveals His "Plan of Loving Goodness"
51 "It pleased God, in his goodness and wisdom, to reveal himself and to make known the mystery of his will. His will was that men should have access to the Father, through Christ, the Word made flesh, in the Holy Spirit, and thus become sharers in the divine nature."2
We can only go to the Father through Jesus (John 14:6); He is our only Mediator (1 Tim 2:5) for He is the only One who redeemed us on the Cross (1 Tim 2:6), no one else. A man (Adam) sinned thus breaking that initial close relationship, which is an offense against God who is infinite; therefore, the only way for us to be redeemed had to be done by another truly and fully man, but also, someone whose reparation be eternal, so this Person also had to also be truly and fully God. And that only One who was able to atone for this great damage was our Lord Jesus Christ. But we, as members of the Body of Christ, can intercede for each other (1 Tim 2:1-4) in the Holy Spirit towards this Redeemer, Jesus. The members of the Body of Christ do not cease to live at our corporal deaths; for we have been made in the image and likeness of God who is Spirit, thus we have an spiritual soul who is immortal. This soul continues to live for we don't have a God of the death but of the living (Mark 12:27). Therefore, we can also pray to the Saints and Angels in Heaven in order to intercede for us before Jesus. The role of an Angel is to be a "Messenger" (this is what the word Angel means) and we have some Angels at our service (Matt 18:10), so, just as God sends messages to us through His Angels, we can send back messages from us to God through His Angels ("Messengers"). We can pray directly to God (in Jesus' name), of course we can and we must do!, but we can also use the help of these close friends of God in order to intercede for us.
52 God, who "dwells in unapproachable light", wants to communicate his own divine life to the men he freely created, in order to adopt them as his sons in his only-begotten Son.3 By revealing himself God wishes to make them capable of responding to him, and of knowing him and of loving him far beyond their own natural capacity.
We become sons and daughter of God at Baptism, with this Sacrament, we eliminate Original Sin (and personal sin if the person has it) and the due punishment for sin up to that point and acquire sanctifying grace which allows us to access Heaven. A person who dies without the state of grace goes straight to Hell.
53 The divine plan of Revelation is realized simultaneously "by deeds and words which are intrinsically bound up with each other"4 and shed light on each another. It involves a specific divine pedagogy: God communicates himself to man gradually. He prepares him to welcome by stages the supernatural Revelation that is to culminate in the person and mission of the incarnate Word, Jesus Christ.
God treats us like a good Father to His children. When we are little, soft food, but when we start to get stronger, another king of food is given us. This is the reason why God had to treat and teach the people of the O.T. with a different approach; but once God became man, the fullness of His revelation has come manifest.
St. Irenaeus of Lyons repeatedly speaks of this divine pedagogy using the image of God and man becoming accustomed to one another: the Word of God dwelt in man and became the Son of man in order to accustom man to perceive God and to accustom God to dwell in man, according to the Father's pleasure.5
Now that God has become man, we can know and understand God even better, even like a Friend (John 15:15).
John 3:27; John 15:5; Matthew 19:26