Pirlo was outstanding in victory over Parma on Sunday.
"When Pirlo told me that he was coming to Juventus the first thing that I told him was 'thank goodness'," stated the goalkeeper.
"Getting a player of his level and worth was the deal of the century - especially as he was also available on a free transfer.
"When I saw him play, I thought 'there is a God' because his footballing skill is really embarrassing," added Buffon.
"I saw Galliani in the summer and I thanked him for making the championship a much more balanced affair."