The traditional faith of the Pueblo people and the Catholicism of the Spanish people who have moved into the area are very different religions. However, the people who follow each faith respect the other people and their traditions even though they don't understand them. There is mutual kindness and space to practice each of their own traditions, even if they find the other traditions strange or unnecessary.
One of the major places where the religions in the story disagree is over who sends the rainclouds. In the Catholic faith, God is the one God, who controls everything. Only he can create and send rainclouds. For the Pueblo people, however, their dead loved ones have a hand in sending the rain to their people.
When Teofilo dies, his grandsons don't want Father Paul and his Catholic traditions involved in his burial. They want him to have a traditional Pueblo ceremony. When Louise suggests letting Father Paul sprinkle holy water on Teofilo, however, they agree to it—but not the Last Rites or Mass. They're sure that with the holy water, Teofilo won't be thirsty.
Once the holy water has been sprinkled and the burial is done, Leon is happy. He believes that Teofilo will send them rainclouds now. This shows how the two religions can work together and continue having a peaceful community.