It’s purely your imagination that “the faith” always means “faith in Christ”.
Likewise, their wives must be reverent, not slanderers, temperate, faithful in all things.1 Timothy 3:11 -
https://www.biblegateway.com/passage?search=1 Timothy 3:11&version=NKJV
Deacons, just like a deacon’s wife, are to be “faithful in all things”, not just in Christ. Some people departing from the faith that God created both marriage and food as good things, does not a de-salvation passage make.
Paul didn’t say departing from the faith is departing from the faith in Christ. You do, not him.
We are discussing the term “the faith”; a noun.
We are not discussing the word “faithful” an adjective.
Now you are attempting to change the discussion topic because you can not explain why you think the term the faith changes from passage to passage.
The meaning of the term “the faith”, doesn’t change, as it continues to mean the same thing; faith in Christ.
Please read the simple context in 1 Timothy 3:8 - 1 Timothy 4:1, and
explain to all of us why you think the meaning of the term “the faith”, changes from one passage to the next.
Likewise deacons must be reverent, not double-tongued, not given to much wine, not greedy for money, holding the mystery of
the faith with a pure conscience. But let these also first be tested; then let them serve as deacons, being found blameless. Likewise, their wives must be reverent, not slanderers, temperate, faithful in all things. Let deacons be the husbands of one wife, ruling their children and their own houses well. For those who have served well as deacons obtain for themselves a good standing and great boldness in
the faith which is in Christ Jesus.
These things I write to you, though I hope to come to you shortly; but if I am delayed, I write so that you may know how you ought to conduct yourself in the house of God, which is the church of the living God, the pillar and ground of the truth. And without controversy great is the mystery of godliness:
God was manifested in the flesh,
Justified in the Spirit,
Seen by angels,
Preached among the Gentiles,
Believed on in the world,
Received up in glory.
Now the Spirit expressly says that in latter times some will depart from
the faith, giving heed to deceiving spirits and doctrines of demons, 1 Timothy 3:8-4:1
JLB