not loyal (to a person, one's country etc)

unfaithful

a person guilty of, supporting, heresy; a person who holds an unorthodox opinion

schismatic

unorthodox

unorthodox

wicked (the more usual word)

not religious

a person who changes her or his political or religious beliefs and joins a rival group

rebellious

a person who betrays a friend, is disloyal to his country etc

person who is disloyal

a person who leaves one group and joins another

traitor

not patriotic

disloyal