Responses

Wait he said that nailing her to the cross could cause reincarnation.
-> Jesus was betrayed by a companion and then killed by nailing him to a cross. Jesus resurrected due to god's power.
-> The saintess was betrayed by a companion and killed by binding her to a cross and burning her. The saintess resurrected due to god's (the spirits power).
(⊙…⊙ )
...So the warrior was summoned in the typical hero-trope.
He made sure the saintess was killed and knew of the possibility of reincarnation.
Before he seemed to be on good terms with the saintess and even told her about horror-movies that he liked.
Now she seems to use beings from the horror movies (zombie).
Interesting. Is there a novel?