Apostasy is to abandon, denounce, reject, or fall away from one’s faith.
Various translations of the Bible uses others words, which also mean apostasy, such as faithfulness, waywardness, rebellion, and turning away.
A person who commits apostasy is called an apostate.
A lifelong student of the Bible, Peter DeHaan, PhD, wrote the 700-page website ABibleADay.com to encourage people to explore the Bible. His main blog and numerous books urge Christians to push past the status quo and reconsider how they practice their faith in every area of their lives.