The verses you gave are just saying that some fall short and become defiled but if you look at the whole chapter they are in it is not speaking of one who is saved falling away but you didn't bother to read the whole chapter did you?
No you just cherry pick verses to suite your need again read the whole chapter the message is not about believers falling away but look what I found by reading the whole chapter
Hebrews 6:4-6
For it is
impossible, in the case of those
who have once been enlightened, who have tasted the heavenly gift, and have shared in the Holy Spirit, and have tasted the goodness of the word of God and the powers of the age to come, and
then have fallen away,
to restore them again to repentance, since they are crucifying once again the Son of God to their own harm and holding him up to contempt.
Not only have you not been able to refute the original verse I gave you but this verse is also very clear
The verses you gave you have to try to make it say something it isn't but the verses I gave are plain and simple clear as day so how do you explain away this verse?