Can a denomination be in error?

June 8, 2025 Day 159
The twenty-third question in our catechism is:
“Can a denomination be in error?”
The answer is:
“Yes. The Roman Catholic Church and the Eastern Orthodox Churches are in error, both in matters of liturgy and life, as well as in matters of doctrine.”
cf. Romans 11:20-22; Revelation 2:14,16,20 and Article 19.