"be they Baptists or Presbyterians"

 Presbyterianism is a Christian denomination based on Calvinism.  It emphasises the sovereignty of God, the importance of following the scriptures and the necessity of grace (being moral and pure) through faith in Christ.

Presbyterianism evolved in Scotland in 1707; the church has 'elders' rather than bishops, specially commissioned non-clergy who take part in local pastoral care and decision-making at all levels.

Baptists are a different Christian denomination, one which emphasises infant baptism, salvation through faith alone, and the supremacy of Scripture. The earliest Baptist church has been traced to Amsterdam in 1609.

Both churches are forms of Protestantism.