There's a song that says, "Everybody talkin' 'bout heav'n that ain't goin' there." And this includes some church folks who are doing the talkin. Some disagree and suggest that no true Christian could ever be lost. What does the Scripture say? Consider...
-Specific warnings against apostasy (Hebrews as a whole & 2 Pet 2:18-22)
-The conditional nature of salvation (The “IF” passages: John 8:31; John 15:1-6; Rom 11:17-22; 1 Cor. 15:1-2; Col 1:21-23)
-The naming of apostates: Hymenaeus & Alexander (1 Tim 1:19-20); Demas (2 Tim 4:10)
-Charges to protect the flock: Acts 20:28-30
-Passages naming those who have fallen away and prove to be a danger to others (1 Tim 1:18-20, 2 Tim 2:16-18)
-Passages in which the author complains that their work may be in vain among believers (Gal 4:9-11, 1 Thes 3:5)
-The possibility that a person’s name can be removed from the book of life. (Rev 3:5)
The BOTTOM LINE: There are some in the faith who won't stay in the faith.
1 Corinthians 10:12: So, if you think you are standing firm, be careful that you don't fall!