One thing almost completely missing in the church today is Biblical church discipline. People who live unchristian lives are allowed to remain in the church as members.
Unbelievers serve in church offices.
Ministers are allowed to preach anything and everything, no matter how unbiblical it may be. Sin, unbelief, backsliding, disobedience are rarely even rebuked. The result of this lack of discipline is that sin in all its ruinous power flourishes and grows in the church, so that eventually the church is ruined. Christian discipline reaches its conclusion in censure and excommunication. That Christian discipline involves such extreme measures is probably the chief reason it is seldom carried out.