Well, I'm not going to waste my whole day arguing with people who I have no choice but to consider being in unbelief by what they defend in the church. But I will take the time to explain to you what is so wrong and disheartening about fellow-shipping with people who say they are a Christian and are even active in the church but who do not live sanctified lives but rather willfully indulge sin.
You see, I want to live for God and do what's pleasing to him, because I believe the gospel and want to live in the manifest joy of his presence. And I need the encouragement and edification of other believers. I'm not an island unto myself. God designed us to need each other and be unified in the building up of each other. But it's incredibly disheartening to want that and seek that but be among others who don't want that and are willfully living in their sins, and thinking 'OSAS' as the defense for that lifestyle of sin. There is zero power in that kind of a meeting. But that is what the church is these days--Spiritless, dead, weak, boring meetings that don't help anybody lead a holy life.