This is stated in a context of salvation (Mt. 7:13-14; 21-23). Jesus categorically states that "false prophets" INWARDLY THEY ARE bad. Then he illustrates it metaphorically again categorically denying that anything inwardly bad can bring forth good fruit.
False prophets teach a false gospel (Mt. 7:13) and make a false profession (Mt. 7:21-23). They proclaim faith in Christ PLUS "have we not done" kind of gospel. Their gospel is a MIXTURE of faith and works (sand) and not the solid rock.
John categorically states we are to believe not "every spirit" and in particular the kind of spirits that characterize a "false prophet" (1 Jn. 4:1) and contrasts those spirits IN THEM versus the Holy Spirit in true believers ("greater is he that is IN YOU than he that is IN the world").
Benny Hinn, and the rest of the charismatic false prophets have demonic spirits IN them and their FRUITS of false prophecies manifest that and their gospel of faith plus works manifest that.
Thank you The Biblicist, because Matthew 7:15-20 now gives my answer to question #1 in literal speech: No, false prophets cannot be saved. Jesus says so bluntly, since they produce no good fruit.
The Greek used for false prophet is pseudoprophetes which seems to imply an actual prophet as opposed to a teacher. Thus, I must do more research on false teachers as a separate matter. However, this would imply that the spirit in those who prophesy in the Charismatic and Pentecostal movements is alien to the Holy Spirit, and thus they are in fact false prophets and are in fact not saved. I say this because to be a true prophet is something they cannot pass at all: Accurate prophecy that proves they are from God (Deuteronomy 18: 20-22).
I now recognize that posting my discussion earlier in Baptist General Discussion and Christian Forums about how to do accurate prophecy is in fact a death penalty crime to Jesus. I have had to repent in terror before our Father, but it is godly for it leaves no regret and shows me I have an advocate in God's Son (2 Corinthians 7:10 and 1 John 2:1)
This also answers my question #2 because the spirit of false prophecy is the spirit of the antichrist according to 1 John 4:1-3 . For a false prophet to be a false prophet they must have this spirit even if everything seems entirely mundane and non-supernatural.
I have had to again go to our Father in Heaven in terror. This time to repent of ever letting the spirit of the antichrist work through me at all. This repentance leaves deep sadness but no regret. I am humbled to know Jesus is my advocate before the Father.
Because I know myself to be a Believer thanks to the supernatural conviction of the Holy Spirit nine months ago, I have this to say about my own salvation: It seems I am saved, as I have not changed suddenly with this repentance as I did nine months ago when I repented of not putting faith in Jesus, but I was lost in sin and in need of repentance ASAP. I will reflect on this more and get back to you guys and gals.