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I don't mean IMPOSSIBLE because I believe that the bible is inerrant:

Romans 2:5 But according to thy hardness and impenitent heart, thou treasurest up to thyself wrath, against the day of wrath, and revelation of the just judgment of God.
6 Who will render to every man according to his works.
7 To them indeed, who according to patience in good work, seek glory and honour and incorruption, eternal life:
8 But to them that are contentious, and who obey not the truth, but give credit to iniquity, wrath and indignation.

Romans 2:13 For not the hearers of the law are just before God, but the doers of the law shall be justified.
14 For when the Gentiles, who have not the law, do by nature those things that are of the law; these having not the law are a law to themselves:
15 Who shew the work of the law written in their hearts, their conscience bearing witness to them, and their thoughts between themselves accusing, or also defending one another,
16 In the day when God shall judge the secrets of men by Jesus Christ, according to my gospel.

However when Christ gives us the means to salvation, as revealed in the scriptures, and we choose to reject those means, preferring rather the traditions of men such as Calvin and Luther, then we can hardly be said to be working out our salvation in fear and trembling as St. Paul admonishes the Philipians so to do:

2:12 Wherefore, my dearly beloved, (as you have always obeyed, not as in my presence only, but much more now in my absence,) with fear and trembling work out your salvation.