I have checked and according to Google the UCC has not joined the PCUSA. The whole philosophy of Congregationalism is not in line with the Presbyterianism structure of governance or John Knox. Even the UPC could not agree on loose affiliation with the UCC. I hope some member of the Church reads this and amends the mistake . Sincerely, Jesus David Rodriguez ; Feb. 20,2014 P. S. I have been to both before and find them very enlightened and uplifting.