Synonyms of apostatize
defectIf you defect, you leave your country, political party, or other group, and join an opposing country, party, or group.
• a KGB official who defected in 1963
desertIf someone deserts, or deserts a job, especially a job in the armed forces, they leave that job without permission.
• He deserted from the army last month.
Thesaurus for apostatize from the Collins English Thesaurus