Presumption ... may also be regarded as a product of pride.
[Presumption] may be defined as the condition of a soul which ... hopes for salvation without doing anything to deserve it,...
Ephesians 2:8 For by grace you have been saved through faith. And this is not your own doing; it is the gift of God, 9 not a result of works, so that no one may boast.
So how is presumption about pride? How is it prideful to say "I'm saved because of Christ's merit rather than my own." I totally agree that faith without works is dead, but the works do not earn us salvation, they merely show that faith is living.
For the sin of presumption, what kind of statement do you make for the anti-presumption? Would you say "I'm saved because I've done the works to deserve it." How is this not prideful?
Those born from above are because of the Grace of God in Christ. we who are born from above are because of the Promise of God, not our presumption.
A proper interpretation of the sin of presumption is to go on sinning, and just claim that you would still be forgiven. Did not Jesus say “Go and sin no more”? Of course there are dead churches that continue to revel in sin, well, Revelation has some to say about them.
Yet some believe that the sin of presumption is the belief of the assurance of Salvation. This I think comes from the idea of salvation by works, when in fact the real Work was done on the Cross and by His Resurrection.