Final answer:
In the episode 'Christening' of The Office (S7E7), Jim and Pam Halpert had considered joining a church group headed for Mexico, but later change their minds.
Step-by-step explanation:
In the episode 'Christening' of The Office (S7E7), the two office members who initially decide to join a church group headed for Mexico but later change their minds are Jim Halpert and Pam Halpert. They initially show interest in the group, but once they learn that the church group's intentions are to convert people to their religion rather than providing humanitarian aid, they decide against going.