On the road to answering the question regarding the omission of the word "saints" in the intro to Galatians, this episode notes that the same omission occurs in the books of 1 and 2 Thessalonians. Paul uses the words "saints" in 6 of his 9 epistles to churches. The episode notes Augustine's distinction between the visible and invisible church, and posits that Paul addressed his letters to the visible church, which included believers and unbelievers. Christ's use of the word church in Matthew 16:18 only referred to believers. "Upon this rock, I build my church." The distinction between the visible and invisible church might possibly influence how the question is ultimately answered.
“Also no Salutations to Saints in Thessalonica”
In: 1 Corinthians 1:2, 1 Corinthians 3: 1-3, 1 Thessalonians 1:1, 2 Corinthians 1: 2, 2 Corinthians 5:21, 2 Thessalonians 1:1, Augustine, church, Colossians 1:2, Colossians 1:21-22, Ephesians 1:1, Galatian Letters, Galatians 2:2-3, holiness, imputed righteousness, Philippians 1:1, Romans, Romans 1:7, saints, salutations