This brings me to "Pagan Christianity", a highly informative and insightful book by Frank Viola & George Barna which explores the pagan origins of many current church beliefs & practices. It is available from many retail sources including Amazon which has used paperback copies available from $3.38 (At least as of today, 3-20-2020). In addition, Thriftbooks (www.thriftbooks.com) often carries copies (I spotted three hardcover copies of the 2008 edition for $7.86 each with free shipping and fifty hardcover copies of the 2012 edition for $14.30 each with free shipping).
If the truth indeed makes one free, get a copy of "Pagan Christianity" and prepare to be liberated!