The leaven of the Pharisees is their teaching, which substitutes the written Word of God for oral traditions.
There is scant fear of God in the church -- our sin is theological, not carnal.
Jesus Christ is a harsh and difficult master -- many Christians and Pastors will go to hell.
The "Tribulation" of Matthew 24 has already happened for so many Christians over the centuries -- you wait in vain for a rapture to save you from trials.