It's not what I see but what you're not seeing. The Greek word for "severed" has 2 uses, according to my lexicon. To free from, dissever from. Paul would have contradicted himself if he meant to be unsealed in Him. Because Eph 1:13,14 is clear about being sealed from a single occurrence of "having believed" and the sealed one being a possession of God and is guaranteed for the day of redemption.
To sever is to cut off. But here Paul is saying "you who would be justified by the law" are severed or cut off from Christ. He is talking about circumcision and the benefit of circumcision. So it's not really relevant.
Eph 1:13-14
13 And you also were included in Christ when you heard the word of truth, the gospel of your salvation. Having believed, you were marked in him with a seal, the promised Holy Spirit, 14 who is a deposit guaranteeing our inheritance until the redemption of those who are God's possession — to the praise of his glory.
What is being said if not a guarantee of eternal security by means of this sealing?
Having believed the gospel that was preached to them. You're assuming Paul preached OSAS, but as I told you before, the only thing that is irrevocable is God's word.
So, to be "free from" Christ doesn't mean to lose salvation, as commonly assumed or presumed, but by means of returning to the failed Law system which Christ fulfilled by His own sacrifice, one has become free from (severed from) the benefits of being in union with Him.
Free from the benefits of being in union with him? The consequence of falling away is death and eternal destruction. 2 Thess. 1:8-10
What are the benefits? Fellowship, which is described as being "filled with the Holy Spirit" in Eph 5:18 or "walking by means of the Spirit" in Gal 5:16. Those so filled or walking by His means cannot sin. That is a definite benefit.
Fellowship is not the same thing as being filled with the Spirit. Paul said don't get drunk with wine but be filled with the Spirit. Eph. 5:18 certainly does not mean they can not sin, otherwise Paul would not say 'do not sin.' Eph. 4:26 and do not grieve the Spirit Eph. 4:30 And quench the Spirit does not mean loss of fellowship. To quench is to put out as a fire is put out.
The flip side is to either grieve the Spirit (Eph 4:30) or quench the Spirit (1 Thess 5:19), which means loss of fellowship, or not being filled with the Spirit and not walking by His means.
So, one is "severed" from Christ WHENEVER they are sinning, which means they are grieving the Spirit and quenching Him.
If my analysis is incorrect, please take it point by point and please show me where I'm wrong in my analysis.
No. We are not severed from Christ when we sin. We are disciplined, not severed.