I am quoting Scripture which states that one must endure to the end. If one can simply be saved by making an altar call and then go about sinning the rest of their lives, then you are calling Christ a liar.
Did you ever bother reading the rest of the chapter which explains what the 'end' is???
"believe on the Lord Jesus Christ and thou shalt be saved." Not believe and go door to door, go to church, give a percentage of your money, never sin again, do lots of good things... and on and on. Just believe. Evidently the Lord I believe in is more giving, forgiving and sheds more grace than a lot of my christian brother's Lord.