Its an attack upon the Redemptive work of Christ !
Those who deny the Eternal Security of the Believer in Jesus, not only deny the very Power of God that guards them unto that eternal inheritance that is truly theirs
1 Pet 1:4-5
4To an inheritance incorruptible, and undefiled, and that fadeth not away
, reserved in heaven for you,
5Who are
kept by the power of God through faith unto salvation ready to be revealed in the last time.
They also attack the Perfection of the Redeeming work of Christ, for each He redeemed by His blood.
Scripture says that they have been redeemed by the precious blood of the Lamb from a vain conversation, that is, a worthies manner of life of Idolatry.
1 Pet 1:18-19
18Forasmuch as ye know that ye were not
redeemed with corruptible things, as silver and gold,
from your vain conversation received by tradition from your fathers;
19But with
the precious blood of Christ, as of a lamb without blemish and without spot:
That word from in vs 18 is the prep ek and means:
out of, from, by, away from
The blood of Christ redeems the sinner out of or away from a vain manner of Life.
The word redeemed in vs 18 is the greek word lytroō and means:
to release on receipt of ransom
2) to redeem, liberate by payment of ransom
a) to liberate
b) to cause to be released to one's self by payment of a ransom
Notice " To cause to be released to one's self. Christ by his Blood caused the release of those He died for, unto Himself, He redeemed them unto His self, He caused it. How ? By His blood.
That thought is more explicitly conveyed here
Titus 2:14
14Who gave himself for us, that he might
redeem us from all iniquity, and purify
unto himself a peculiar people, zealous of good works.
Also this Redemption is Eternal as stated in
Heb 9:12
Neither by the blood of goats and calves, but by his own blood he entered in once into the holy place,
having obtained eternal redemption for us.
There is absolutely no end to the redeeming effects of the Blood of Christ for His People He died for.
Now, to those who deny and reject this Truth, you deny and reject the Perfection of the Redemptive work of Christ, which is nothing short of Blasphemy !