Mainline protestant denominations are also sometimes referred to as the “Seven Sisters”. As you might guess, there are seven of them:
United Methodist Church
Presbyterian Church USA
Evangelical Lutheran Church (ELCA)
Episcopal Church (PECUSA, ECUSA, or TEC, depending on which way the wind is blowing)
American Baptist Church
United Church of Christ
Disciples of Christ
More broadly, the term ‘Mainline’ might also be used to refer to Protestant Churches which are members of the National Council of Churches and the World Council of Churches.
Generally speaking, these churches should be avoided by Christians.
Amen to that!