Confessions and Church Discipline

As an officer (if you're not, pretend you were), would you discipline a member for deviating from your church's confession in their personal beliefs? The presbytery decides what kinds of deviations are or are not acceptable for a minister, but what about churches and their normal members?

I suppose the answer would be "it depends - how much of a deviation?"

In my view, it would certainly be appropriate to discipline a member for deviating from something like the Trinity or the divinity of Christ. But I would not discipline a member for being egalitarian or for rejecting a regular day view of Genesis 1 (provided that they did not seek to teach these views and draw away the disciples after themselves). I would even be hard pressed to discipline a member who took a different view of the atonement.

I remember Hodge saying something in his systematics to the effect of the only confession we ought to require for membership is "Jesus is Lord".

Where would you draw the lines?

Generally, in most Presbyterian churches, it has to be a doctrine that is essential to the faith for non-officers to be formally disciplined. The OPC Book of Discipline says:
"An offense which is serious enough to warrant a trial is: (1) an offense in the area of conduct and practice which seriously disturbs the peace, purity, and/or unity of the church, or (2) an offense in the area of doctrine for the nonordained member which would constitute a denial of a credible profession of faith as reflected in his membership vows, or (3) an offense in the area of doctrine for the ordained officer which would constitute a violation of the system of doctrine contained in the Holy Scriptures as that system of doctrine is set forth in our Confession of Faith and Catechisms." Has to be a deniable of a credible profession of faith to do discipline on doctrine, so in the cases you state it would not be enough if they quietly held to those views.

It depends at least in part on whether the church holds to confessional membership. The PCA (and most other Presbyterian bodies I'm aware of) do not require members to hold to the Westminster Standards.