As far as the Bible is concerned all believers in Jesus Christ are "saints".
Romans 1:6-7
7 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.
NAS
1 Corinthians 1:1-2
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 upon the name of our Lord Jesus Christ, their Lord and ours:
NAS
2 Corinthians 1:1-2
1:1 Paul, an apostle of Christ Jesus by the will of God, and Timothy our brother, to the church of God which is at Corinth with all the saints who are throughout Achaia: 2 Grace to you and peace from God our Father and the Lord Jesus Christ.
NAS
Ephesians 1:1-2
1:1 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: 2 Grace to you and peace from God our Father and the Lord Jesus Christ.
NAS