Ordinary men persist in beliefs which they have accepted without questioning and they are attached to them, instinctively they don’t approve of anything which is not familiar to them at all, because it threatens their very being,
スラッシュは、関係代名詞、前置詞の前、カンマに入れます。
Ordinary men persist in beliefs/ which they have accepted without questioning/ and they are attached to them,/ instinctively they don’t approve of anything /which is not familiar to them at all, /because it threatens their very being,