There have been a lot of famous ministers ans ministries that have denied the faith recently.
Those that God gave to his Son to die for their sins (John 6:37) have the security of their eternal inheritance. Once they have been born by natural birth into this world, and then are born again, (Eph 2:1-5), they cannot lose their inheritance. They can lose their fellowship with God when they commit a sin, because God will not fellowship with sin.
God will, however, chasten them by pricking their hearts, to feel guilty until they repent and regain their fellowship with God.
Salvation is a deliverance. There is an eternal deliverance, and there are many deliverances that the child of God receives as he sojourns here in this world.
If you are interpreting all of the salvation scriptures to eternal salvation, they will sway you to believe that eternal deliverance is gained by your good works. Eternal deliverance is by God's sovereign grace. Timely deliverances are gained by your good works.
Matt 24:11-13 - And many false prophets shall rise, and shall deceive many, and because iniquity shall abound, the love of many shall wax cold, but he that endures unto the end, the same shall be saved (delivered, from being deceived)
Enduring to the end, is an effort (work), the same shall be saved (delivered). This is an example of timely salvation by the works of mankind.
These, so called, ministers that have denied the faith, have not lost their eternal inheritance, but have temporary lost their fellowship with God, until they repent.
Anytime a scripture directs someone to repent, it is not directed to the unregenerate person, because they will not repent of breaking a spiritual law of a spiritual God, that they cannot understand, and thinks it to be foolishness (1 Cor 2:14). But repentance is directed toward the born again child of God, who has had his stony heart exchanged for a heart of flesh, (Ezk 11:19), that can be pricked to feel guilt. (Acts 2:37).