a member of clergy to attest the purity of their (选项还有his)lives and worship the God
a clergy to attest the purity of their lives, worshipping the god
我们怎么觉得两处的their应该用his 去指代前面的a member
NY Times里的相似句子:
The act of diary-keeping, after all, began in the 16th century as a means for clergymen to attest to the purity of their lives and prove their worthiness to God.