Here "turning away ... from him" is a metaphor for started to doubt or no longer trust God. Alternate translation: "you are so quickly starting to doubt him" (See: [[rc://en/ta/man/translate/figs-metaphor]])
Here "turning to" is a metaphor that means to start to believe something. Alternate translation: "you are instead starting to believe a different gospel" (See: [[rc://en/ta/man/translate/figs-metaphor]])