OK, just for the record, can you share exactly where “according to Scripture, all believers in God and Jesus are saints.” ? That would be a good start to the discussion because the Scripture has lots to say and the word saints isn’t a big part of it
1 Corinthians 1:2
To the church of God which is at Corinth, to those who have been sanctified in Christ Jesus, saints by calling, with all who in every place call on the name of our Lord Jesus Christ, their Lord and ours:
to all who are beloved of God in Rome, called as saints: Grace to you and peace from God our Father and the Lord Jesus Christ.
Greet Philologus and Julia, Nereus and his sister, and Olympas, and all the saints who are with them.
and He who searches the hearts knows what the mind of the Spirit is, because He intercedes for the saints according to the will of God.
that I may be rescued from those who are disobedient in Judea, and that my service for Jerusalem may prove acceptable to the saints;
Greet every saint in Christ Jesus. The brethren who are with me greet you. All the saints greet you, especially those of Caesar’s household.
that is, the mystery which has been hidden from the past ages and generations, but has now been manifested to His saints,
1 Timothy 5:10
having a reputation for good works; and if she has brought up children, if she has shown hospitality to strangers, if she has washed the saints’ feet, if she has assisted those in distress, and if she has devoted herself to every good work.
1 Corinthians 14:33
for God is not a God of confusion but of peace, as in all the churches of the saints.
Now as Peter was traveling through all those regions, he came down also to the saints who lived at Lydda.
Paul, an apostle of Christ Jesus by the will of God, To the saints who are at Ephesus and who are faithful in Christ Jesus:
To the saints and faithful brethren in Christ who are at Colossae: Grace to you and peace from God our Father.
But immorality or any impurity or greed must not even be named among you, as is proper among saints; and there must be no filthiness and silly talk, or coarse jesting, which are not fitting, but rather giving of thanks.
that you receive her in the Lord in a manner worthy of the saints, and that you help her in whatever matter she may have need of you; for she herself has also been a helper of many, and of myself as well.
contributing to the needs of the saints, practicing hospitality.
but now, I am going to Jerusalem serving the saints. For Macedonia and Achaia have been pleased to make a contribution for the poor among the saints in Jerusalem.
1 Corinthians 6:1
Does any one of you, when he has a case against his neighbor, dare to go to law before the unrighteous and not before the saints?
1 Corinthians 16:1-2
Now concerning the collection for the saints, as I directed the churches of Galatia, so do you also. On the first day of every week each one of you is to put aside and save, as he may prosper, so that no collections be made when I come.
2 Corinthians 9:1-2
For it is superfluous for me to write to you about this ministry to the saints; for I know your readiness, of which I boast about you to the Macedonians, namely, that Achaia has been prepared since last year, and your zeal has stirred up most of them.
For both He who sanctifies and those who are sanctified are all from one Father; for which reason He is not ashamed to call them brethren,
Paul and Timothy, bond-servants of Christ Jesus, To all the saints in Christ Jesus who are in Philippi, including the overseers and deacons:
Greet every saint in Christ Jesus. The brethren who are with me greet you.
2 Thessalonians 1:10
when He comes to be glorified in His saints on that day, and to be marveled at among all who have believed–for our testimony to you was believed.
"I have given them Your word; and the world has hated them, because they are not of the world, even as I am not of the world.
But Ananias answered, "Lord, I have heard from many about this man, how much harm he did to Your saints at Jerusalem;
"And this is just what I did in Jerusalem; not only did I lock up many of the saints in prisons, having received authority from the chief priests, but also when they were being put to death I cast my vote against them.
I pray that the eyes of your heart may be enlightened, so that you will know what is the hope of His calling, what are the riches of the glory of His inheritance in the saints,
1 Corinthians 6:2
Or do you not know that the saints will judge the world? If the world is judged by you, are you not competent to constitute the smallest law courts?
giving thanks to the Father, who has qualified us to share in the inheritance of the saints in Light.
Here is an article that may be of interest
It is important to understand what is being meant when someone uses the word saint.