Many parents thought they would be speaking out "against Islam" if they had questioned changes to the school curriculum at Oldknow Academy, a parent has said.
Mr Mohammed Zabar - a parent with a 10-year-old daughter at Oldknow - said the government report brought him "relief" that he had not overreacted after querying decisions made by the school.
Changes such as cancelling Christmas festivities and the teaching of Arabic over other foreign languages, were some of those challenged by Mr Zabar.
After the Clarke report was published, Mr Zabar said: "I think it now comes to a question of who was responsible for what."
More top news
Theresa May said she is "ambitious and positive" for a Brexit deal as EU leaders gave the go ahead for preparations for second phase talks.
Merseyside Police have launched an investigation after crowd trouble at Goodison Park - during which a fan appeared to attack a player.
US-backed Syrian forces have declared victory in Raqqa days after it said it had cleared the city of members of so-called Islamic State.