We enter in by seeking anf finding. We believe into Jesus the way we enter a house. Jesus is the door..and His words are the door INTO Him. We come out of our own house and enter His. That is the message of John. There is no provision for just having a belief in Jesus while still residing in our own houses, so to speak. Salvation is in Christ....so we must strive to enter into Him.
What does that look like?
Walking in the Spirit!!! Just as John said...when we abide in Christ we walk as Jesus walked. Paul also says this...that when we walk in the Spirit we keep putting to death the deeds of the flesh. The Spirit is life...but remaining in our own strength is death.
We have been around this mountain already. Entering into Christ is initially done by faith. This is called the new birth. It happens as Jesus described in John 3:16 in speaking to Nicodemus on the subject. One does not strive to enter into Christ. One partakes of His body and blood by faith, by the acceptance of the sacrifice that was made on our behalf for the sin which is in us from Adam.
Furthermore, The Holy Spirit is also received by the hearing of faith and not by works of law (Gal.3:5). As for walking in the Spirit, this is not done to determine salvation. The life and death mentioned by Paul are not in the category of "everlasting life".
I don't know how many times I must repeat this and get an agreement, only to be contradicted in another thread or another post, or by another of the three of you who are promoting the same message.
One initially comes into the family of God by way of the new birth...BY FAITH AND FAITH ALONE. One also receives the Holy Spirit....BY FAITH AND FAITH ALONE.
One cannot walk in the Spirit in order to get the spirit. One cannot walk in Christ in order to get Christ. These come first. And when it comes to salvation, these come about by faith and confession as well ( Rom.10:9,10). These principles are clearly outlined and confirmed over and over in the bible and cannot be misunderstood. But Paul mentioned the stumbling stone. Why do men stumble on these things? Simply because it is also a temptation to have a desire to be justified before God by way of our own striving.
One cannot bear fruit apart from being the actual tree. We are the righteousness of God IN CHRIST.
All of the passages that you (three) are quoting concerning being cast out for sin, apply to those who are not in Christ. He will say to those.." I never knew you". How can He say such a thing to one whom He has known?
This is not rocket surgery!! 
Those who do not belong to Jesus will be judged by the flesh and therefore by the law, and therefore will be condemned, because all have sinned and fall short of God's glory.
Those who are in Christ by faith, as Jesus Himself promised, which I quoted in the previous reply from John 5:24, shall not come into the judgment of condemnation, but have passed form death to life. If you want to ignore His words that is your choice, but if you want to discuss this subject openly and honestly with others such as myself, I would appresiate some acknowledgment of the passages I am quoting from and an explanation of how it is that they do not apply to this subject.
I have explained how your references apply to this subject. I have acknowledged the need for walking in the Spirit and the need for doing diligence to what has been given us, but have also shared the truth that these things have no bearing on determining our eternal destiny. As the scripture assures us, those who are in Christ have passed from judgement, from death, and will not be condemned along with those whom Jesus does not know.
The rewards and accompanying honor for what we do in this life in Christ are certainly at stake. We would be remiss in settling for the life that barely makes it in, as though through fire. But as soon as the suggestion comes along that makes salvation a matter of what we do in this life after we have received everlasting life, then we enter into that which has been labelled as LEAVEN. This is the mixture of the two covenants. Paul asked the Galatians who has bewitched them. It is sometimes said that sin causes one to fall from grace, but the fact is, one falls from grace when he goes back to trying to be justified for life by way of works of law. And just so there is no confusing this, sin is transgression of law.
If one quits sinning, he is keeping the law. Is this ok? By all means, as long as it is not done for justification for life.
But this is exactly what you and a few others are suggesting. Therefore you will meet with the same resistance from myself and others as what the Galatians got from Paul. Having begun in the spirit, are we now being made perfect by the flesh? This question was given to those who already had the spirit. They were also told by Paul to walk in the spirit. But in the exact same letter, he warned them that they are not justified for life by this, but that justification comes by faith and faith alone. In their attempt to be justified by the law, this was what Paul called being justified by the flesh.
There can be no mistaking this. We are not being made perfect by what we do in our bodies (flesh). We are not being made perfect by our works, even though they may well be in the Spirit. Our works are not for the purpose of making us perfect or complete. We do not complete the job for ourselves. It is His work He has begun in us and His to finish. And this is exactly what He has promised, as long as one does not completely bury that which Christ has given him. Even a little fruit is enough. We have this assurance.
If you have a problem with this, is your eye evil because He is good? Does it bother you that life is a free gift? If so, then maybe it is because you would rather earn it as a reward rather than humbly accept it without merit. I doubt that this is consciously the case, but then there are these posts that seem to indicate otherwise.