If you read what I’ve posted you will find I have posted scripture, and that the Catechism is based on scripture…however, I heavily quoted scriptures that a person can use for the purpose you seek.
If you don’t find it helpful to read others’ quotes from the Bible, for instance, those given in each of my posts, you may find it helpful to make a close study of the Bible yourself, and read all that Jesus says.
Jesus made it clear that His words, as quoted above from the Bible, were intended and directed towards all people, not simply the Jews,
*“When the Advocate comes, whom I shall send you from the Father, the Spirit of truth who issues from the Father, He will be my witness. And you too will be my witnesses.” *[John 15: 26-27] *“When He comes, He will show the world how wrong it was, about sin…and about judgement” and “about who was in the right: proved by my going to the Father…proved by the prince of this world already being condemned.” *
Jesus promised, “I still have many things to say to you but they would be too much for you now. But when the Spirit comes He will lead you to the complete truth…All He tells you will be taken from what is mine.” “You will receive power when the Holy Spirit comes on you, and then you will be my witnesses not only in Jerusalem but indeed…to the ends of the earth.” [John 16:8-9, 12-13, 15]
Before His ascension, Jesus said,* “All authority in heaven and on earth has been given to me. Go therefore, make disciples of all the nations; baptise them in the name of the Father and of the Son and of the Holy Spirit, and teach them to observe all the commands I gave you. And know that I am with you always, yes even to the end of time.” *[Matthew 28:17-20]
“This mystery [of Christ] that has now been revealed through the Spirit to His holy apostles and prophets was unknown to anyone in past generations; it means that pagans now share the same inheritance, that they are parts of the same body, and the same promise has been made to them, in Christ Jesus, through the gospel.” [Ephesians 3:4-7]
If you read even just the quotes I gave in my posts you have the truth, but you will surely find careful study of the New Testament of great assistance to the questions you are facing. Jesus stated clearly that we must obey the commandments, and this is part of the whole teaching Jesus mandated the disciples to teach to all nations.
I hope you find your answers soon, for your peace of mind, and the benefit of those whom you seek to enlighten.
God bless you