In chapter 4 of the Pearl, what might lead Kino and Juan to believe what the priest said is true and what might lead them to be suspicious?

Juan Thomas is a wise man. He knows the Pearl ignites the greed in the hearts of men. He realizes the pearl upsets the equilibrium of the village. Juan Tomas suspects the priest is in cahoots with the pearl buyers. The priest's sermon basically tells Kino to know his place and sell for what the buyers ask. This seems like the priest is in collusion with the pearl buyers.