Show us the words "lose salvation" in scripture. Salvation is not probation. Eternal life is not temporary life. Jesus is the door. He is not a revolving door.You must be faithful unto death. So, if you're not, you can't ultimately be saved. Initially yes, but you must remain faithful unto death as the scripture says. So bottom line, you CAN lose your salvation.
Notice in Philippians 2:12 that Paul said to "work out" your salvation and NOT "work for" your salvation. When we "work out" at the gym, we exercise to develop our body that we already have and not to get a body. Farmers "work out" the land, not in order to get the land, but to develop the land they already have. The Greek verb rendered "work out" means "to continually work to bring something to completion or fruition." We do this by actively pursuing the process of ongoing sanctification, which is the result of being set apart for God's work and involves the process of being conformed to the image of Christ.Phil 2:12
12Wherefore, my beloved, as ye have always obeyed, not as in my presence only, but now much more in my absence, work out your own salvation with fear and trembling.
This conforming to Christ involves the work of the person, but it is still God working in the believer to produce more of a godly character and life in the person who has already been justified by faith. In verse 13, Paul goes on to say, "for it is God who works in you both to will and to do for His good pleasure." Ongoing sanctification has no bearing on justification. That is, even if we don't live a sinless, without fault or defect, absolute perfect life 100% of the time (which we won't) we are still justified by faith in Christ. (Romans 5:1) Where justification is a legal declaration that is instantaneous, ongoing sanctification is a process.