Un-fallen angels, now and throughout eternity, are certainly capable of sinning. Throughout infinity, we will be too. But they won’t sin; just as we won’t, upon receiving our glorified, immortal bodies.

Both groups will be capable of sinning because freedom of choice won’t be taken away. But obviously none will choose to sin, for God has looked into eternity and has seen and  reported that upon this present earth passing away, sin will exist no more. Revelation 21: 4.

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It’s popularly believed and commonly spoken in Christendom that each believer has a constant guardian angel. Maybe I overlooked it, but I can’t find that explicitly claimed anywhere in the Bible.

However, there is one passage that I think is the one that leads us to think the claim is true. That’s in Matthew 18: 10. In it, Jesus says, “See that you do not look down on one of these little ones. For I tell you that their angels in heaven always see the face of my Father in heaven.”

“These little ones,” in context, can refer to believers or the actual children in the story. But the main thing is that in the Greek, the word “their” is a collective noun. That means angels serve us as a whole. In other words, the angels don’t seem to be guarding us as individuals on a permanent basis.

Rather, as the passage implies, the angels always remain in the Lord’s presence until instructed to come to the aid of the believer as a need arises.

Since it is God who will never leave us nor forsake us, and it is He who causes all things to work together for our good, He is our ever present Guardian.

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If a professed Christian exhibits signs of being demonically possessed – possession defined as a demon(s) completely controlling a person’s thoughts and/or actions – that probably means one of two things. (1) the person’s professed faith isn’t real or (2) if real, the person’s behavior may be the result of demon oppression or extreme psychological problems.

I think that because, biblically, I find only demons being cast out of unbelievers. From what I see, believers are told to outwardly resist the devil , not cast him out from within (James 4: 7; 1 Peter 5: 8, 9).

Furthermore, true Christians are indwelt by the Holy Spirit. And He, the Spirit, is greater than he (Satan) who is in the world (1 John 4: 4). In this case, the Spirit is the strongman of the house and the weaker cannot invade, overtake, nor live in the same domain. For in the same verse, it says the power of the Spirit makes the believer an overcomer of the enemy.

Now, a believer can be attacked from without. All believers have or will experience this to some degree. It’s called demonic oppression or persuasion. It is the act of a demon(s) attacking a person, spiritually, by pressuring and encouraging a person into sinful behavior.

My belief is that under no circumstances can a true Christian be demonically possessed.