Their “method” is to “inform you”, so that you have “knowledge”.
In the Kingdom of God (the Church), however, we have something else. We have the Person, Jesus, in person(a). So, in a manner of speaking, we do not have to search for texts to try and understand what happened. Instead, Jesus, in person(a) tells us who he is and who we are and how we are. He is, in person(a) from God, so his word is certain. When we look in the Scripture, it is not to try and figure it all out, but it is to use profitably for “reproof, correction, and training in goodness (righteousness or justice)”
Jesus, in person, said, “If they hear you, they hear me”, to his apostles. The apostles and those they then sent, in persona Christi, tell you and tell me, when we are conceived physically we are made a living soul (nothing before the body is conceived, but living being body and soul at the moment conceived). Do you hear them? Then you hear Jesus, God, telling you what is. That is “revelation”, the book in the Bible by the same name is not “revelation”, but the Person you hear is “revelation”.
This is that mystery you declare every Sunday at Mass: “I believe in the Holy Catholic Church” - “I hear the word from the Church, which is “in persona Christi”, and in hearing this word and believing it, I am hearing Jesus, face to face”
That is what you can offer them - not a set of historical proof texts, but introduce them to a real person (yourself) who speaks to them in persona Christi of where they came from and when they came to be. You are announcing the Gospel (you are announcing “Official News from your King” which is the meaning of “gospel” in common Greek; it does not mean generic good news, but “governmental official news”)