What does it mean to depart from the faith?
To ‘depart’ in the Greek is aphistēmi which means to revolt against, remove from, desert, depart or draw away from.
You can’t depart or leave something unless you once were in something. Now its debatable whether the one who departs was once really saved or not but they had some understanding. They were enlightened. Scriptures tell us that if one has been enlightened and tasted of heavenly things and falls away it is impossible for them to repent.
For it is impossible for those who were once enlightened, and have tasted of the heavenly gift, and were made partakers of the Holy Ghost, And have tasted the good word of God, and the powers of the world to come, if they shall fall away, to renew them again unto repentance; seeing they crucify to themselves the Son of God afresh, and put him to an open shame. Hebrews 6:4,6
Now the Spirit speaketh expressly, that in the latter times some shall depart from the faith, giving heed to seducing spirits, and doctrines of devils. 1 Timothy 4:1
This “departing” is departing from the faith or pistis. That is the conviction of reliance upon Jesus Christ for salvation. Instead those who depart give heed to demonic doctrines which do not rely on Jesus Christ for salvation.
Some departing doctrines are obvious to most Christians but others are very subtle. That devil is a wily one.
The main theme to look for is if the teacher or preacher, prophet or apostle, pastor or evangelist moves away from trusting in Jesus Christ for salvation. Even a teeny weeny bit.
There is no specific day of the week, no ritual or rite, no performance, no other way, no other man made book, no self help principle, no personal preference, no successful endeavor, no jot or tittle, no other name, no addition, no subtraction. NOTHING.
There is nothing that can give you salvation with eternal life but complete trust and reliance on Jesus Christ alone for salvation.
It is written.
That if thou shalt confess with thy mouth the Lord Jesus, and shalt believe in thine heart that God hath raised him from the dead, thou shalt be saved. For with the heart man believeth unto righteousness; and with the mouth confession is made unto salvation. Romans 10:9,10