Besides the fact that 2 Timothy is Pseudipigraphic, let's examine the rest of the context: The word here is also used for "Disown". (NIV)
Disown can mean those who simply turn their back on belief in him altogether.
Right. If we deny or disown Christ, reject Christ and his death on the cross to have paid the penalty of our sin, he rejects us. For it is only through the cross that any man may get to Heaven, it is like a bridge...
Also, perhaps you'd like to explain what exactly you think "Dead to sin" means.
Dead to sin means that sin no longer holds power over us. We are dead to sin and alive unto God. The strength of sin is the law, the sting of sin is death. If there was a law that could make us righteous, God would have given it, but righteousness comes by faith in Christ alone. When we trust in Christ we are dead to the sting of death and the law that shows us we have sinned. The law is good in that it shows us we all have sinned and are in need of a Saviour. When we consider ourselves dead to sin, we do not let sin rule us, we can overcome it and actually obey God's Law, now written in our hearts, even better.
Do you think this means you can sin however you want but what you do is not considered sin?
No, sin is still sin and has consequences in this life and the next.
Since you say "Not sinless", how do you define "Dead to sin", as a "Get out of sin free" Card where sin is not really sin? Obviously it means avoiding sin (i.e. "lawlessness").
Sin is still sin and no one gets by with it, it has its consequences now and hereafter, eternal consequences, even for believers, being dead to sin, because we are crucified with Christ, buried with him in baptism, having trusted him, we can have power and victory over sin, because we are, in fact, dead to it. Avoiding sin is just part of it, a by-product of being dead to sin because of Christ's finished work on the cross and having trusted him. For if our sins are forgiven and paid for and we now have God's righteousness freely given to us and his Spirit living in us, we can overcome sin or lawlessness with his power working in us. However, I said we are not sinless because we still have our old sinful nature, our 'old man', so we are not yet made completely perfect. Scripture says to put on the new man and not yield to the old man, to sin. But we will not be completely sinless until the resurrection and rapture of living believers when we shall all be changed from mortal to immortal and from corrupt (sinful) to incorrupt (sinless). (1 Cor, 15, 1 Thess. 4) To be dead to sin the way I phrased it is actually defined in Romans 6:
6
What shall we say then? Shall we continue in sin, that grace may abound?
2 God forbid. How shall we, that are dead to sin, live any longer therein?
3
Know ye not, that so many of us as were baptized into Jesus Christ were baptized into his death?
4 Therefore we are buried with him by baptism into death: that like as Christ was raised up from the dead by the glory of the Father, even so we also should walk in newness of life.
5
For if we have been planted together in the likeness of his death, we shall be also in the likeness of his resurrection:
6 Knowing this, that our old man is crucified with him, that the body of sin might be destroyed, that henceforth we should not serve sin.
7
For he that is dead is freed from sin.
8 Now if we be dead with Christ, we believe that we shall also live with him:
9 Knowing that Christ being raised from the dead dieth no more;
death hath no more dominion over him.
10 For in that he died, he died unto sin once: but in that he liveth, he liveth unto God.
11
Likewise reckon ye also yourselves to be dead indeed unto sin, but alive unto God through Jesus Christ our Lord.
12
Let not sin therefore reign in your mortal body, that ye should obey it in the lusts thereof.
13
Neither yield ye your members as instruments of unrighteousness unto sin: but yield yourselves unto God, as those that are alive from the dead, and your members as instruments of righteousness unto God.
14
For sin shall not have dominion over you: for ye are not under the law, but under grace.
15
What then? shall we sin, because we are not under the law, but under grace? God forbid.
16 Know ye not, that to whom ye yield yourselves servants to obey, his servants ye are to whom ye obey; whether of sin unto death, or of obedience unto righteousness?
17 But God be thanked, that ye were the servants of sin, but ye have obeyed from the heart that form of doctrine which was delivered you.
18
Being then made free from sin, ye became the servants of righteousness.
19 I speak after the manner of men because of the infirmity of your flesh: for as ye have yielded your members servants to uncleanness and to iniquity unto iniquity; even so now yield your members servants to righteousness unto holiness.
20 For when ye were the servants of sin, ye were free from righteousness.
21 What fruit had ye then in those things whereof ye are now ashamed? for the end of those things is death.
22
But now being made free from sin, and become servants to God, ye have your fruit unto holiness, and the end everlasting life.
23
For the wages of sin is death; but the gift of God is eternal life through Jesus Christ our Lord.
Now also note another critical issue: It says we must ENDURE or SUFFER. Do you think suffering or enduring merely means keeping up this particular Theology of yours? I assume you don't think it involves actually obeying his teachings, right? So how does the suffering part play into your equation?
It says if we suffer, we will reign with him. Those Christians (already freely saved believers in Christ) who suffer persecution, ridicule, death, torture, imprisonment etc. for believing in Christ or sharing the Gospel will be rewarded. Part of that reward is they will have higher positions in Christ's Kingdom and will rule and reign with him. Many Christians at the Judgment Seat of Christ will have all their works burn up like wood, hay and stubble, but will still be saved, but without reward or position. Other's works will endure and be as gold, silver and precious jewels and they will have honor and position in Christ's Kingdom.
10 For we must all appear before the
judgment seat of Christ; that every one may receive the things done in his body, according to that he hath done, whether it be
good or bad. 2 Cor. 5
11
For other foundation can no man lay than that is laid, which is Jesus Christ.
12 Now if any man build upon this foundation gold, silver, precious stones, wood, hay, stubble;
13 Every man's work shall be made manifest: for the day shall declare it, because it shall be revealed by fire; and the fire shall try every man's work of what sort it is.
14 If any man's work abide which he hath built thereupon, he shall receive a reward.
15 If any man's work shall be burned, he shall suffer loss: but he himself shall be saved; yet so as by fire. 1 Cor. 3
Just as there are varying degrees of Hell, there are varying degrees for believers, eternity will not be the same for all believers, although they are saved from Hell. Those who have matured and grown in grace and sacrificed and perhaps gave their lives for Christ will have much more than those who got saved but did not grow much, did not try to overcome sin and loved this world too much and did little or nothing for Christ. Look at how much Paul went through, beaten, stoned, imprisoned, shipwrecked, etc. to reach the lost...Now he will have great reward, me, not so much, but I'm working on it.