How to respond to those who divide religious innovations (bid'ah) into five categories, citing 'Umar's statement: "What a good innovation"?

Question:
Honorable Shaykh, may Allah grant you success. A questioner says: Some students of knowledge divide bid'ah (religious innovations) into five categories, such as obligatory and recommended innovations, and so on. They cite what is reported from 'Umar (may Allah be pleased with him) regarding "what a good innovation." How is the answer to that?

Answer:
There is nothing good in bid'ah (religious innovations), and it is not called "a good innovation." 'Umar meant the linguistic sense; the linguistic bid'ah, not the Shari'ah bid'ah. When he gathered the people for the Ramadan prayer behind a single imam, who was Ubayy ibn Ka'b (may Allah be pleased with him), and he went out while the people were praying behind their imam, it is reported from him, and Allah knows best, that he said, "What a good innovation this is, because it is an act that had no precedent." So it is a linguistic bid'ah, not a Shari'ah bid'ah. Yes.