“While the Presbyterian Church is preeminently a doctrinal Church, she never demands the full acceptance of her standards by any applicant for admission to her fold. A credible profession of faith in Christ is her only condition of Church membership. She does demand that her ministers and elders shall be Calvinists; yet this is never demanded of lay members. As Calvinists we gladly recognize as our fellow Christians any who trust Christ for their salvation, regardless of how inconsistent their other beliefs may be. We do believe, however, that Calvinism is the only system which is wholly true” (Loraine Boettner, The Reformed Doctrine of Predestination, p. 353).
“The position that the officers of a church may have one creed, and the membership another, is untenable. No church could live and thrive upon it. A Trinitarian clergy preaching to an Arian or Socinian membership, would preach to unwilling hearers. And although the difference is not so great and so vital, yet a Calvinistic clergy preaching to an Arminian membership, or an Arminian clergy to a Calvinistic membership, would on some points find unsympathetic auditors. Pastor and people, officers and members, must be homogenous in doctrine, in order to a vigorous church-life” (W.G.T. Shedd, Calvinism: Pure & Mixed, p. 9; underlining mine).
I suppose that while Shedd would prefer (personal taste, you know) a “vigorous church-life;” Boettner, in the name of “epistemological humility,” will settle for church-life that is more feeble.