Hi. I believe the words "the faith" (Gr. tês pisteôs) in this context means the apostolic faith, i.e. the New Testament apostolic body of doctrines, cf. Jude 3, 2John 9 (Christ's doctrine). As the Bible interprets itself I believe it is biblical to look for more clues from other NT passages. I believe we have a parallell passage in 2Thess. 2:3-12. There we have the word apostasy (Gr. apostasia), just as we have its verb form in the 1Timothy passage (verse 1, apostêsontai) under consideration. This 1 Tim. passage does not refer to some elected and saved of God going to hell, for that is impossible according to God's word. It refers to certain/some (Gr. tines)who are in a state of professing adherence to the New Testament apostolic faith, Christ's doctrine, but who nevertheless will in both doctrine and practice apostasize from it (cf. Tit. 1:16, 2Tim. 3:5), giving heed to deceiving spirits and doctrines of demons. Those who do so may not even be aware of it, but they may sincerely believe they are doctrinally orthodox. I believe the beginning of such a major departing from the apostolic NT faith was evidenced as the Roman Catholic church began to come into existence in the 300's AD. This harlot church, if I am correctly informed, imposes on its clergy that they be unmarried. This same professing body has many demonic doctrines such as the transsubstantiation heresy, purgatory, papal infallibility, Mary's perpetual virginity and her being co-mediator with Christ etc. etc. And out of this mother harlot has sprung dozens and again dozens of smaller daughter harlot synagogues of Satan (cf. Rev. 2:9).
Harald