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To find the church storage room passcode in South Park go into room to the right:

Go into the room to the right to find the church storage room passcode.
Then go up to the book on the stand and use the book:

Read the book on the stand to find the church storage room passcode.
The passcode is on the last page. For me the passcode was 681:

The church storage room passcode is on the last page of the book.