Mr. Ferrell states the differences very well. I've been a member of excellent churches in both denominations and can offer one additional insight, if I may. It seems to me that some (certainly not all) of the weaker churches in the PCA were ones that pulled out of the old PCUS. In many cases, it appears that congregations were moving away from specific problems with the mainline churches, but they weren't moving toward a solidly reformed theological position.

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JWithnell
Member Bethel OPC
Virginia