Here's some passages the eternal security proponents can't explain away.
They must ignores these passages to keep their position.
Romans 11:21,22 - For if God spared not the natural branches, take heed lest he also spare not thee.
Behold therefore the goodness and severity of God: on them which fell, severity; but toward thee, goodness, if thou continue in his goodness: otherwise thou also shalt be cut off.
2 Peter 2:20 - For if after they have escaped the pollution of the world through the knowledge of the Lord and Savior Jesus Christ, they are again entangled therein, and overcome, the latter end is worse with them than the beginning.
James 5:19,20 - Brethren, if any of you do err from the truth, and one convert him;
Let him know, that he which converteth the sinner from the error of his way shall save a soul from death, and shall hide a multitude of sins.
When a Christians error4s from the truth, they have turned away from the Lord and have become sinners once again and they are no longer in right standing with the Lord until they turn away from their sin and confess their sin to the Lord so they can have mercy
Proverbs 28:13 - He that covers his sins shall not prosper: but whoso confesses and forsakes them shall have mercy.
There's no mercy for those that do not confess and turn away from their sin because God is not mocked what we sow is what we reap and if we sow to the flesh we shall of the flesh reap corruption (Gal 6:7,8)
Those teaching eternal security are mocking God