And grieve not the holy Spirit of God, whereby ye are sealed unto the day of redemption.
I believe that some of the verses were taken out of context and others simply did not answer your queston. I believe that you are right: your salvation cannot be taken from you. How can you undo what Christ has done? Also, the verse of 1John 3:15 states: Whosoever hateth his brother is a murderer: and ye know that no murderer hath eternal life abiding in him.
I don't know about you, but I have hated before and if I were to hate someone on my deathbed I am not about to believe that I will not go to Heaven because of that. Also, where in the Bible does it state that suicide is the same as murder? Where does it state that suicide is the only unforgivable sin? I would ask that person to back that up with scripture!!! A couple of these responses are based upon works based salvation, which is unscriptural. (Ephesians 2:8-9) Last time I checked the Lamb's Book of Life didn't come with an eraser for the blood of the Lamb, with which our name is written when we are saved. Also, the message implied that if we don't live a perfect life, we won't see Heaven when we die, also false. We are human, we sin!!! If you were hit by a car today crossing the street and you had not repented for all of your sins (even the little evil thoughts that cross your mind!) but you are saved by the GRACE of God, you will go to Heaven. We are sealed to the Holy Spirit when we are saved, period. We cannot be seperated from it! (Ephesians 4:30) The are no loopholes, no gates to check, no ways to be bought, no entry earned, all who go to Heaven do so through Salvation and the Grace of God. Also, Samson took his own life when he collapsed the colliseum upon himself and those in attendance. Yet in Hebrews 11:32 he is mentioned as a Hero of Faith. However, suicide does not let God work through one's life as He had planned to do! And yes, it is a sin. If a Christian commits suicide, he has taken away any chance that he had to bring others to Christ , to provide an example for others to live and for Christ to act through them!!!! Trials are meant for Christ to strengthen us and have us grow closer to God through them. Also, God does not give us anything that we cannot handle! We often give ourselves more than we belive we can handle, but through Christ all things are possible. (Phillipians 3:14) If you know anyone who is a Christian and is contempltig suicide, I would remind them of this. Beware of any "conclusions" that some bring through their own "logic" and focus instead upon scripture to guide your path, it is the Word of God.