Concerning the original post:
1. Matt7:13 Enter ye in at the strait gate: for wide is the gate, and broad is the way, that leadeth to destruction, and many there be which go in thereat:
14 Because strait is the gate, and narrow is the way, which leadeth unto life, and few there be that find it.
The words are straight and narrow, meaning only one way, this dosen't tell you how.
2. Heb6:4 For it is impossible for those who were once enlightened, and have tasted of the heavenly gift, and were made partakers of the Holy Ghost,
5 And have tasted the good word of God, and the powers of the world to come,
6 If they shall fall away , to renew them again unto repentance; seeing they crucify to themselves the Son of God afresh, and put him to an open shame.
Notice it says "if", further on down, same chap.
9 ¶ But, beloved, we are persuaded better things of you, and things that accompany salvation , though we thus speak.
The jews were used to giving sacrafice once every year, these verses are showing the folly in doing so in reference to Christ.(nobody lost anything)
3. Luke12:46 The lord of that servant will come in a day when he looketh not for him, and at an hour when he is not aware, and will cut him in sunder, and will appoint him his portion with the unbelievers.
Notice the term Son of man earlier in the chap., the context is Israel. All of Israel is God's servants, saved or lost.
Le 25:55 For unto me the children of Israel are servants; they are my servants whom I brought forth out of the land of Egypt: I am the LORD your God.
4. 1 ¶ Moreover, brethren, I declare unto you the gospel which I preached unto you, which also ye have received, and wherein ye stand;
2 By which also ye are saved, if ye keep in memory what I preached unto you, unless ye have believed in vain.
One is a saving faith, the other, an intelectual belief. For ex. "I believe God exists" vs " I'm trusting Jesus' blood shed on calvary to save me"
5. Jas5:19 Brethren, if any of you do err from the truth, and one convert him;
20 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.
This does not say damnation, there is a sin unto death. He wouldn't refer to him as brother if he wasn't saved.
6. Heb10:26 For if we sin wilfully after that we have received the knowledge of the truth, there remaineth no more sacrifice for sins,
27 But a certain fearful looking for of judgment and fiery indignation, which shall devour the adversaries.
One can recieve the knowledge of how to get saved without recieving Christ as Saviour. The sin would be unbelief.
7. 1Cor9: 27 But I keep under my body, and bring it into subjection: lest that by any means, when I have preached to others, I myself should be a castaway.
The context is testimony, if I don't keep my flesh in check, nobody's gonna' believe my testimony because I'm worldly.
Will finish later, gotta put the children to bed.