B
1. You should be ashamed of yourself. May the Lord temporarily stop your pushing of such evil here to show you otherwise. A believer striving to do what is right always and stumbling on occasion (Not intending or wanting to sin) is not an excuse for sin. Does the drunk who stumbles on his road to recovery in the wrong? Is the person who stumbles on their road to losing a bunch of weight in the wrong? I say thee nay. A person who is striving to do what is right is not in the wrong.
OSAS is the evil teaching that gives a person an excuse to sin because you don't ever have to worry about sin. For in OSAS: You can sin and still be saved. No sin can truly separate you from God and His salvation. In other words, it's like telling a child that they shouldn't eat candy but if they do, there is no actual consequences (That will truly matter) in doing so.
2. You can't repent of future sin. That doesn't make any sense. You can only confess of past sins. Nowhere does the Bible teach that we are forgiven of future sin. Nowhere did the apostles teach such a thing. One has to take the word "all" and make it say that. No verse specifically says future sin is forgiven.
3. I actually do not believe you when you say that one who practices sin does not know God. You believe a person can be out of fellowship with God and still be saved. Which is basically saying they can sin and still be saved. You also don't believe any sin can separate a person from the love of God. You believe physical death is the result for sin and not spiritual death for the believer. Yet it is different somehow for the unbeliever. As if God is a respecter of persons.