What was the context of the phrase ”Separation of Church and State” and how has it been perverted?

How has the anti-Christ Leftists perverted the original meaning of Separation of Church and State.

Both clauses regarding the Freedom of Religion protects the individual from government overreach. 

Where did the phrase "Separation of Church and State" come from?  

Gideon got cocky and backslid, most by trying to be both Church authority and State authority and brought destruction.