No, your sin can only cause you to lose your salvation if it hardens your heart to unbelief and you turn away from God:
"12See to it...that none of you has a sinful, unbelieving heart that turns away from the living God. 13 But encourage one another daily, as long as it is called “Today,” so that none of you may be hardened by sin’s deceitfulness." - Hebrews 3:12-13
We've been over this numerous times. We don't find the words "lose your salvation" in Hebrews 3:12-13. What we do find: Hebrews 3:8 - Do not harden your hearts as in the rebellion, in the day of trial in the wilderness, 9 Where your fathers tested Me, tried Me, And saw My works forty years. 10 Therefore I was angry with that generation, And said,
'They always go astray in their heart, And they have not known My ways.' Not descriptive of genuine believers. There is no loss of salvation here. Only a failure to receive it. Verses 18-19 - And to whom did He swear that they would not enter His rest, but to those who did not obey? So we see that they could not enter in because of
unbelief. That explains the hardened heart. It took them in the opposite direction of God. Heard the truth for a time, but then hardened heart and departing from God became their final answer.
*Jude 1:5 - The Lord delivered His people (the Israelites) out of Egypt,
but later destroyed those who did not believe.
Hebrews 3:14 - For we
have become [past tense Gk. verb, gegonamen, meaning we have become already] partakers of Christ, if we hold fast the beginning of our confidence steadfast to the end. Notice that this is essentially a repeat of verse 6, where we read: but Christ was faithful as a Son over His house -
whose house we are, if we hold fast our confidence and the boast of our hope firm until the end. The wording is not - "and you will become (future indicative) partakers of Christ if you (future indicative) hold fast." It is rather - "you have been, and now are, partakers of Christ
(demonstrative evidence) if in the future you hold fast."
The point is that not all of these Hebrews have become partakers of Christ and of course, the only ones in the end who will be identified as genuine believers/partakers of Christ will have been those who held fast the beginning of their confidence steadfast to the end. Those faltering Hebrews who depart from God may begin with loud confidence and profession of loyalty. But then later?
Future perseverance is proof of genuine conversion.
You just cannot seem to grasp that deceived make believers are mixed in with genuine believers. Hebrews 4:1 - Therefore, since a promise remains of entering His rest, let us fear lest any of you seem to have come short of it. 2 For indeed
the gospel was preached to US as well as to THEM; but the word which THEY heard did not profit THEM, not being mixed with faith in those who heard it. 3 For
WE who have believed do enter that rest, as He has said: "So I swore in My wrath, 'They shall not enter My rest," although the works were finished from the foundation of the world.
Obviously, not all of these Hebrews were genuine believers. Notice that verses 2-3 makes a
distinction between
US who have BELIEVED and do enter that rest and
THEM who heard the word but did not mix faith with what they heard and will not enter that rest because of UNBELIEF.