You are hereUCG.org / Sermons / Reverse Engineering the Holy Days Reverse Engineering the Holy Days Given on Mar 9, 2013 by Rex Spears Listen Downloads MP3 Audio (9.44 MB) Downloads Reverse Engineering the Holy Days MP3 Audio (9.44 MB) × There are days that God has declared HOLY and yet, most of mankind either ignorantly sets aside or has no knowledge of them.