I suppose the most egregious denial of the need to be a vital part of a church is the commonly heard statement that "There is no such thing as a perfect church."
Of course there is no perfect church. The statement is so self-evident that it borders on the ridiculous. Where did anyone ever get the idea that a church might possibly be perfect anyway? Clearly not from the New Testament. Not one church in the New Testament seems to have been without major problems.
I still remember when I heard students in the 1960s suggest that what we really needed was a "New Testament Church." I once asked, "Which one? The one in Ephesus that had left its first love? The one in Laodicea that was lukewarm? Or how about the one in Corinth with all its specific problems enumerated in Paul's two epistles?"
I have come to the simple conclusion that people today will find any reason possible for remaining neutral, or negative, toward becoming deeply involved in a local church. Idealism is the enemy of reality in most instances. Never was this more true than when people talk about the perfection of the church as a reason for not committing themselves wholeheartedly to other believers in a specific assembly.