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It appears attributed to Sagan in Judson Poling's 2003 book "Do Science and the Bible Conflict?", but without source. 
Misattributed 
Source: Via  Google Books https://books.google.com/books?id=Ondv5WzhYYYC&pg=PA21&dq=Sagan
                                    
 
        
     
                             
                             
                             
                             
                            