"Accept for gospel" is an idiomatic expression that means to accept something as true without questioning or doubting it. There are several synonyms that can be used instead of "accept for gospel" such as "take at face value", "believe unquestionably", "swallow whole", "not question", "not doubt", "not challenge" and "not dispute". These synonyms convey the same meaning as "accept for gospel" and can be used interchangeably in different contexts. It is important to note that blindly accepting something without questioning can lead to potential errors and misunderstandings. Thus, it is always advisable to verify and validate information before accepting it as true without any proof or evidence.