Mr. Alrawi said that several copies of the book had been confiscated by the police during a raid Friday at the headquarters of the Islamic Foundation, a community center in Prague, the Czech capital.

Lukas Lhotan, a former convert to Islam who has since become an outspoken critic of the religion, said Monday that he had filed a criminal complaint against the book this month on the grounds that it preached dangerous radicalism. Mr. Lhotan said the book advised Muslims to form Muslim governments wherever they are, and called Jews the enemies of Islam.

Mr. Philips had previously argued that there was no such thing as rape in marriage under Shariah, the legal code of Islam based on the Quran, and he has also come under criticism in Britain for seeming to condone suicide bombers.

On Monday, he vehemently defended the book, saying that millions of copies had been published in Muslim communities around the world. He said that the book was a commentary on Islamic theology and that there was “no place for racism” in the book. Any action against the book, he said, could “constitute an attack on Islam itself.”

Mr. Alrawi, who represents Muslim organizations in the Czech Republic, said the Czech edition of “The Fundamentals of Tawheed,” which was first published in 2012, had been overseen by a small group of people and had not been sufficiently vetted. “We made a mistake of not having thoroughly overseen the publication of the book,” he said. “We were not aware that some of its passages could be in breach of Czech law. Our association certainly does not hold any extremist views.”