Priests are called father because it would be suspicious to call him daddy.
Father or Daddy: A Priest Conundrum
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Explanation
Explain Bear
Alright, listen up, you chucklehead. So, basically, priests are called "father," right? Normal. But if you call 'em "daddy," it implies something...ahem...inappropriate. Get it? It's funny 'cause it hints at scandalous behavior. Now quit staring at me and go read a book, you illiterate oaf.