This is an interesting question and arguably the central conflict of Marlowe's play: does Faustus believe he can be redeemed? From the very first scene, he appears to have given up on the idea of spiritual redemption, because Christian doctrine (which he quotes in Latin) seems to suggest redemption is not possible:
Stipendium peccati mors est [...]
The reward of sin is death: that's hard.
Si peccasse negamus, fallimur, et nulla est in nobis veritas;
If we say that we have no sin, we deceive ourselves, and
there's no truth in us. Why, then, belike we must sin, and so consequently die:
Ay, we must die an everlasting death.
Faustus's pursuit of magical powers is born from the despair this belief has engendered in him. If, no matter how good a man is, he is sinful by nature and therefore damned, there is no point in being good. One may as well try to gain as much power and pleasure as possible on earth, since damnation awaits everyone after death.
The Good Angel urges Faustus away from this line...
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