To me OSAS is just peoples philosophy. There is an overwhelmingly amount of scriptures that say a person can be saved and still fall away from the faith. No way that the New Testament would warn us over and over again about something that cant happen.
And it is true that we are all bad. By going bad I mean you abandon your faith. We are saved by faith and not by works, but if people think they can be a Christian and just live life however they choose and still go to heaven, thats not true. We have to turn from certain life styles. We have to be "washed". I know people can have strongholds in their life, and God is very patient with those who are trying, but you have to be trying.
1Co 6:9 Know ye not that the unrighteous shall not inherit the kingdom of God? Be not deceived: neither fornicators, nor idolaters, nor adulterers, nor effeminate, nor abusers of themselves with mankind,
1Co 6:10 Nor thieves, nor covetous, nor drunkards, nor revilers, nor extortioners, shall inherit the kingdom of God.
1Co 6:11 And such were some of you: but ye are washed, but ye are sanctified, but ye are justified in the name of the Lord Jesus, and by the Spirit of our God.