Church rolls suggest there were 1.1m Mormons in Brazil in 2010, but only about 227,000 Brazilians identified as Mormon in the census the same year.
提前感谢老师们答疑！
identify as sb/sth 这个结构中，identify可与物，也可以不及物。比如the free dictionary 关于identify as词条的解释和例句：
identify as
To classify or label someone or oneself as something. A noun or pronoun can be used between "identify" and "as."
The guy on the security camera isn't a criminal after all—someone in the next block identified him as one of their neighbors.
If you don't identify yourself as a member of this community, I'm going to call the police!
Growing up, I always thought I was straight, but now I identify as bisexual.
所以你的句子中的identified为过去式，是谓语动词的一般过去时。不是过去分词。没必要改为were identified, 虽然改了也是正确的。
