You could if not for Grace through Christ. The Good Shepherd knows his sheep and calls then by name. The one and the only sin that can not be forgiven of man is Blasphemy against the Holy Spirit. The ultimate and complete rejection of the call to salvation given to a person.
Life hands persons events that can make them fall events beyond what their spirit and mind can take. Does it mean they fall beyond the very salvation given them if they can not recover from it? No. But it does mean that their life on earth is not peaceful as GOD would desire. The cost for that is paid here on earth.
The saved person fallen who doesn't repent will be among the least in the Kingdom on Heaven. Unless our final words on this earth are "LORD please forgive me" we all die in our sins one are as bad as a hundred before GOD. The wages of sin is death and all will be required to pay it. Sin is just that. You are just as guilty at that point as the drunk Deacon or the thief or even the preacher who left fly a few foul words when working on the house. Even the saved shall give account for their deeds and thoughts.
This isn't an accounting to condemn you to hell but rather to determine your rewards in the Kingdom of Heaven as your sinful body and mind has passed away and is taken away separated from the new reborn person at our physical death.
These two conditions of man co-exist in each other till death do they part. No one not even the Pope will live without sin even after excepting salvation. If it were possible then salvation through Christ would not be needed. It is a preparation for a life in the Kingdom GOD has readied for us.
While we most certainly will pay for our sins on earth we will know them no more when we die and come before GOD as they will be removed from us and we will be reborn beings as GOD originally intended for us to be without sin and the curse. GOD will look upon us at that time and will not see our sins but rather His Son.
* Augustine, Admonition and Grace, A.D. 426....
But if someone already regenerate and justified should, of his own will,relapse into his evil life, certainly that man cannot say:I have not received because he lost the grace he received from God and by his own free choice went to evil.
St. Augustine
He was handed over for our offenses, and he rose again for our justification. What does this mean, for our justification? So that He might justify us; so that he might make us just. You will be a work of God, not only because you are a man, but also because you are just. For it is better that you be just than that you be a man. If God made you a man, and you made yourself just, something you were doing would be better than what God did. But God made you without any cooperation on your part. For you did not lend your consent so that God could make you. How could you have consented when you did not exist? But He who made you without your consent does not justify you without your consent. He made you without your knowledge but He does not justify you without your willing it