The lie/deceit begins when one replaces "work out" your salvation with "work for" your salvation. "Obtaining or maintaining salvation" by works isn't mentioned anywhere. That is eisegesis. Roman Catholics make the same error.
W A Criswell emphasizes that Philippians 2:12-13 "must be read together for a proper understanding. “Work out your own salvation” means to “work out,” not “work for.” A “works salvation” is not being taught. The idea is to progress to the finish or completion in spiritual growth and maturity. This process is what the Bible calls “sanctification.” It should be noted that Phil 2:12 makes it clear we are to be active, not passive, in this process. However, though we are active, we are not alone. Phil 2:13 reminds us again that the entire salvation process is the work of a sovereign God and the result of His grace (Ed: Ministered by the indwelling Holy Spirit).. (Criswell, W A. Believer's Study Bible: New King James Version. 1991. Thomas Nelson)
Kenneth Wuest writes in regard to "your own salvation" that...When Paul was with them, his teaching instructed them, his example inspired them, his encouragement urged them on in their growth in grace. Now in his absence they were thrown upon their own initiative. They must learn to paddle their own canoe. Thus Paul sets before them their human responsibility in their growth in grace, for sanctification is in the apostle’s mind. They have their justification. Their glorification will be theirs in eternity. Their growth in Christ-likeness is the salvation concerning which Paul is speaking. Thus, the saints are exhorted to carry their growth in grace to its ultimate goal, Christ-likeness.
John Walvoord - These verses have been subject to considerable misunderstanding in that the emphasis seems to be upon self-effort. What does it mean to work out one’s own salvation? Some have attempted to support the idea that when God saves a soul it is then up to the individual to possess and achieve the ultimate goals of salvation in Christ. They view Christianity as a step-ladder which reaches from earth to heaven which it is our duty to climb. A careful examination of this passage, however, will not justify this immature conclusion. First of all, the salvation which is in view in this passage is not salvation from the guilt of sin. This is accomplished once and for all when a sinner receives Jesus Christ by faith as the One who bore his sins in His own body on the cross. In this sense, salvation is accomplished once and for all. The salvation that is in view in this passage, therefore, is deliverance from the power of sin, and the experience and manifestation of the new life in Christ. Like all other forms of salvation, it is a work of God but involving to a larger degree the element of individual experience and participation. It is therefore described as a human work in the expression: “Work out your own salvation with fear and trembling.” What does this mean? As many have pointed out, it is not possible to work out something which is not already possessed. In other words, having received Christ as our Savior and having become a child of God, one has received many things which relate to his salvation which are true of every Christian, such as the indwelling presence of the Holy Spirit, eternal life, and the new possibility of serving God acceptably. The exhortation is to the point that this manifestation of salvation (Ed: progressive sanctification, growth in Christ-likeness) in life is one of the supreme goals of Christian experience, the details and realization of which is of such importance that one should approach the task with fear (cf 1 Pe 1:17, 2 Cor 7:1) and trembling. The exhortation to accomplish this is couched in most loving terms by the apostle. He reminds the the Philippians of their past experience of always obeying, a yieldedness to God that was manifested not only when he was there but also in his absence. Now without his presence in their midst they were to give themselves all the more to a diligent working out of their salvation. In a word, it is an exhortation to realize the whole program of God in sanctification, testimony, and growth in grace.
Harry A. Ironside has an interesting introductory note on this next section applying the truth more to the entire body of believers rather than to individual believers writing that...Philippians 2:12 has often perplexed those who thought they saw clearly from Scripture the simplicity of salvation by grace, apart from works. Here, in seeming contrast to that doctrine, the apostle told the saints to work out their own salvation with fear and trembling, as though there were a possibility that salvation might be forfeited because of failure to work it out properly. Notice first, however, that the apostle did not speak of working for salvation. He spoke of working it out, which is very different.
You still cannot seem to grasp that there are 3 tenses to salvation. 1. We have been saved from the PENALTY of sin (justification) 2. We are being saved from the POWER of sin (ongoing sanctification) 3. We will be saved from the PRESENCE of sin (glorification)