James 2:14-26
Revised Standard Version Catholic Edition (RSVCE)
Faith without Works Is Dead
14 What does it profit, my brethren, if a man says he has faith but has not works? Can his faith save him?[a] 15 If a brother or sister is ill-clad and in lack of daily food, 16 and one of you says to them, “Go in peace, be warmed and filled,” without giving them the things needed for the body, what does it profit? 17 So faith by itself, if it has no works, is dead.
18 But some one will say, “You have faith and I have works.” Show me your faith apart from your works, and I by my works will show you my faith. 19 You believe that God is one; you do well. Even the demons believe—and shudder. 20 Do you want to be shown, you foolish fellow, that faith apart from works is barren? 21 Was not Abraham our father justified by works, when he offered his son Isaac upon the altar? 22 You see that faith was active along with his works, and faith was completed by works, 23 and the scripture was fulfilled which says, “Abraham believed God, and it was reckoned to him as righteousness”; and he was called the friend of God. 24 You see that a man is justified by works and not by faith alone. 25 And in the same way was not also Rahab the harlot justified by works when she received the messengers and sent them out another way? 26 For as the body apart from the spirit is dead, so faith apart from works is dead.
This would be the most apt scripture for the initial discussion in my opinion.
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The trinity is a trickier subject, being as it is usually a matter of traditional interpretations of a few scriptures.
Here are the main scriptures used to argue against the trinity.
Deuteronomy 6:4 (Revised Standard Version Catholic Edition)
4 “Hear, O Israel: The Lord our God is one Lord;[a]
Footnotes:
Deuteronomy 6:4 Or the Lord our God, the Lord is one Or the Lord is our God, the Lord is one Or the Lord is our God, the Lord alone.
Psalm 83:18
Revised Standard Version Catholic Edition (RSVCE)
18 Let them know that thou alone,
whose name is the Lord,
art the Most High over all the earth.
John 17:3
Revised Standard Version Catholic Edition (RSVCE)
3 And this is eternal life, that they know thee the only true God, and Jesus Christ whom thou hast sent.
Galatians 3:20
Revised Standard Version Catholic Edition (RSVCE)
20 Now an intermediary implies more than one; but God is one.
Scriptures used to argue pro Trinity
Matthew 28:19
Revised Standard Version Catholic Edition (RSVCE)
19 Go therefore and make disciples of all nations, baptizing them in the name of the Father and of the Son and of the Holy Spirit,
John 10:30
Revised Standard Version Catholic Edition (RSVCE)
30 I and the Father are one.”
John 1:1
Revised Standard Version Catholic Edition (RSVCE)
The Word Became Flesh
1 In the beginning was the Word, and the Word was with God, and the Word was God.[a]
Footnotes:
1.1 John begins by giving his Gospel a theological background. By speaking at once of “the Word” he implies that his readers are familiar with the term. To Gentiles it indicated some form of divine revelation or self-expression. Jews would equate it with the divine Wisdom described in Proverbs, which already appears as something more than a divine quality and has some relationship with the visible world. In Sirach and Wisdom the idea is further developed. In the last-named book, Wisdom appears as a pre-existing person, taking part in the creation of the world and having a mission to reveal God to his creatures; cf. Wis 7.22–8.1.
Of course the entire thing is complicated by the fact that if you hold a viewpoint that is not in line with your denominations beliefs you are an apostate, so be sure to consult with your spiritual leaders before coming to too many conclusions if you want to stay in good standing with your church...