Here is the WHOLE sentence in Philippians. Verse 12 is only part of a sentence, not the whole thing.
Philippians 2:12-13 12 Therefore, my beloved, as you have always obeyed, so now, not only as in my presence but much more in my absence, work out your own salvation with fear and trembling, 13 for it is God who works in you, both to will and to work for his good pleasure.
For the believer, we CANNOT contribute our own good works to our salvation because it's not even us doing it. It's God Himself.
The point I’m making is not faith vs works, it’s certainty of salvation.
Read what I wrote again:
Is the biblical attitude of fear and trembling towards ones salvation consistent with the authors belief of easy certainty?
Beloved: But be ye doers of the word and not hearers only, deceiving your own selves. For if a man be a hearer of the word and not a doer, he shall be compared to a man beholding his own countenance in a glass. For he beheld himself and went his way and presently forgot what manner of man he was. But he that hath looked into the perfect law of liberty and hath continued therein, not becoming a forgetful hearer but a doer of the work: this man shall be blessed in his deed. And if any man think himself to be religious, not bridling his tongue but deceiving his own heart, this man's religion is vain. Religion clean and undefiled before God and the Father is this: to visit the fatherless and widows in their tribulation and to keep one's self unspotted from this world.