Solved Helping the Church Quest.

[Luiz]

Well when I finnaly got to Matey rank I spoke to port royal's priest. He sent me to Bridgetown to solve the problem about Father Gerald's faith and I succesfuly figuered out he was inocent and told to him. Then I asked him about the frigate that was stealing children and he said that I should speak with father Garreth for further information. The problem is, that I didnt found that father at the church...

 

[Pieter Boelen]

Have you had a look here? http://www.piratesahoy.net/wiki/strange-things/

Father Gareth doesn't appear until after:

Talk to tavernkeeper about Black Frigate – talk to Baltesar Figueiredo – Quest Book Update

 

[Luiz]

Thanks for the info, dont even need to tell me where to find that man hes probably Portuguese or Spanish, judging by his name