Do you happen to know what the "requirements" were to be a Pharisee?
The word "Pharisee" means a separatist in the Hebrew language. They arose was Greece was spreading its influence across the world as a group opposing Greece's Hellenistic influence in Israel. It started as a social movement, became a school of thought, and eventually a political party in Israel. Most of modern day Judaism is derived from the Pharisee's school of thought.
There wasn't a particular entrance requirement to become a Pharisee, it was the system of belief that a person subscribed to that made them a Pharisee.