Can I lose my salvation?

i recently had a conversation with a few people from the church on this topic and i thought i would post some of my thoughts on this subject. Let's interract together on these.

• If Christ came to seek and save that which was lost, and yet we can somehow become unsaved—and therefore undo what Christ came to do—would it not be wise for God to take us on to Heaven the moment we are saved in order to insure we make it?
  
• If our salvation is not secure, how could Jesus say about those to whom He gives eternal life, “and they shall never perish” (John 10:28)? If even one man or woman receives eternal life and then forfeits it through sin or apostasy, will they not perish? And by doing so, do they not make Jesus’ words a lie?
  
• In Jewish culture, adoption meant that a person could not be sent away, or abandoned, the adopting parents HAD to keep the child regardless of their actions. In Romans, Paul describes us as God’s adopted children. If salvation wasn’t permanent, why introduce the concept of adoption? Wouldn’t it have been better just to describe salvation in terms of a conditional legal contract between man and God?
  
• The authors of the New Testament left us with detailed explanations of how one becomes a child of God; if that process could be reversed, doesn’t it make sense that at least one of them would have gone into equal detail explaining that as well?
  
• The Bible teaches us that we are “sealed” with Him. What is the significance of a seal that can be continually removed and reapplied? What does it really seal?
  
• If a man or woman ends up in hell, who has at some point in life put his or her trust in Christ, doesn’t that make what Jesus said to Nicodemus a lie? Or at best half true?
  
• If my faith maintains my salvation, I must ask myself, “What must I do to maintain my faith?” For to neglect the cultivation of my faith is to run the risk of weakening or losing my faith and thus my salvation. I have discovered that my faith is maintained and strengthened by activities such as the following: prayer, bible study, Christian fellowship, church attendance, and evangelism. If these and similar activities are necessary to maintain my faith—and the maintenance of my faith is necessary for salvation—how can I avoid the conclusion that I am saved by my good works?
  
• If our salvation hinges on the consistency of our faith, by what standard are we to judge our consistency? Can we have any doubts at all? How long can we doubt? To what degree can we doubt? Is there a divine quota we dare not exceed?
  
• If God’s holiness compels Him to take back the gift of eternal life from certain believers because of their sin, one of two things is true: either God compromises His holiness for a time—through their small sins—or man’s good works can meet God’s requirements for holiness—at least for a short period of time. In that case, Christ died needlessly.
  
• If there is an unpardonable sin, Christ did not die for all sin. If He did not die for all sin, there are those to whom salvation is not available. If salvation is not available to all men, John 3:16 and a multitude of other New Testament verses are not true
  
• If Christ was the sacrifice for sin, and yet at the time of His death all your sins were yet to be committed, which of your sins did His blood cover? From the vantage point of the cross, was there really any difference between the sins you committed in the past and those you will commit in the future?
  
• A man does not drift into salvation, does it make sense that he can drift out of it?
  
  Does it make any sense to say that salvation is offered as a solution to our sin and then turn around and teach that salvation can be taken away because of our sin as well?
  
• Can joy and insecurity really coexist? How realistic is it to expect us to rejoice over a relationship that is only as secure as our behavior is consistent?