First, 8:1 only states that there is no condemnation for those who are in Christ Jesus. Nothing about any "forces" that want to separate us from God's love.
Who would be condemning? Obviously forces.
Second, I understand your view about outside forces. However, just as Jn 10:28 also includes ourselves as to who cannot snatch us from God's hand, I believe there is no reason in Rom 8 to exclude anything that occurs either in the present or in the future regarding what can separate us from God's love.
Sadly, you read that into the text. I understand your 'belief', but it does not stand up to exegetical scrutiny. John 10 also refers to outside forces, NOT the sheep themselves.
"No one will snatch them". Security always has to do with outside forces. You don't secure something against your own intervention. That is an oxymoronic assertion.
Interesting that you cite these 2 verses. In Gal 5:4, it was the people themselves who were alienated from Christ by trying to be justified by law, and had fallen from grace. Maybe we understand the phrase "fallen from grace" differently. I view it as personal choices that result in loss of fellowship, and under God's hand of discipline, not loss of salvation.
Or where about to. Paul opens with;
It is for freedom that Christ has set us free. Stand firm, then, and do not let yourselves be burdened again by a yoke of slavery. They were saved ,but ran the risk of rejecting the grace God had supplied for the law which they renounced in following Jesus. If you're a slave to sin you can't be free in Christ.
You may view it this way but it is NOT what is being conveyed. If we are saved because of God's grace then falling AWAY or leaving that grace is rejecting Christ. If we reject Christ we are no longer saved.
And 1 Tim is full of examples of people who have turned away, yet nothing from Paul as to their loss of salvation.
Well I guess you haven't read verse 19 then, but this is type of response only avoids the scripture I supplied and does NOT deal with the issue at hand.
I think this is the bottom line: where are there any clear verses that plainly tell us that one's salvation can be lost, forfeited, etc? Just as I cannot find any clear verses that Christ didn't die for everyone, or that He died only for the elect, I cannot find any clear verses that one can lose salvation.
otoh, there are plenty of verses that clearly indicate that Christ died for everyone, just as there are clear verses that one's salvation is secure.
This is a doctrinal assertion for which you supply no scripture. It is opining in it's truest form, but we are here to accept God's word about this issue, not men's opinion. I have supplied scripture about Christ dying for all.
2 Cor 5:13-14
For Christ’s love compels us, because we are convinced that one died for all, and therefore all died. And he died for all, that those who live should no longer live for themselves but for him who died for them and was raised again.
1 Pet 3:18
For Christ also suffered once for sins, the righteous for the unrighteous, to bring you to God. He was put to death in the body but made alive in the Spirit.
Sorry. Heb 6 deals with believers who have returned to sacrifice in order to avoid being persecuted by Jews. But I don't find anything there about loss of salvation.
Heb 6 is about moving on to a more mature walk with Christ. I have no idea where you get your POV.
Therefore let us move beyond the elementary teachings about Christ and be taken forward to maturity, not laying again the foundation of repentance from acts that lead to death, and of faith in God, instruction about cleansing rites, the laying on of hands, the resurrection of the dead, and eternal judgment.
Clearly v4-6 depict real committed Christians;
It is impossible for those who have once been enlightened, who have tasted the heavenly gift, who have shared in the Holy Spirit, who have tasted the goodness of the word of God and the powers of the coming age and who have fallen away, to be brought back to repentance. To their loss they are crucifying the Son of God all over again and subjecting him to public disgrace.
10:3839 clearly indicates that a believer may "shrink back", meaning not living by faith, and that God will not be pleased with him. But again, nothing that indicates loss of salvation.
Then you are ignoring verse 39 which clearly states;
But we do not belong to those who shrink back and are destroyed, but to those who have faith and are saved.
Shrinking back clearly equates to no longer being saved. In fact Luke says DESTROYED.
God is always displeased when His children sin or disobey. And Heb 12 deals with that issue clearly; discipline which can be quite severe. And 10:30-31 also deals with God's hand of discipline clearly.
We're not dealing with Heb 12 here so please focus on the issue at hand. V30-31 is about those who knowingly reject the Son's sacrifice as v29 shows;
How much more severely do you think someone deserves to be punished who has trampled the Son of God underfoot, who has treated as an unholy thing the blood of the covenant that sanctified them, and who has insulted the Spirit of grace?
This is about those that reject their confession of Christ. Sadly you are eisegeting instead of exegeting. Please look carefully at the scripture itself, without your dogmatic filters.
What all these verses indicate is that when a believer gets into sin, or even fails to live by faith, they come under God's hand of discipline. But none of the warning passages indicate loss of salvation.
Again you are ONLY arriving at this through your Calvinistic POV and not proper hermeneutical exegesis of the scripture. Clearly as the scripture in Heb 6 and 10 IS dealing with saved people, then falling away is falling away from salvation. The warning is not about being a lazy Christian, it's about being a mature and committed Christina who does NOT fall away.
If OSAS were wrong, what specifically causes loss of salvation for the believer?
Many things can contribute or lead up to apostasy, and the NT warns us in many places about it and avoiding it.
2 Thess 2:3
Let no one in any way deceive you, for it will not come unless the apostasy comes first, and the man of lawlessness is revealed, the son of destruction.
Clearly, apostasy equates to destruction, not OSAS.