Answer: In their 2008 book Pagan Christianity, authors Frank Viola and George Barna present the surprising origins of many of the practices commonly found in churches today. The authors claim that many common church practices / traditions actually have their roots in paganism (non-Christian religions), not in the Bible. But is it accurate to claim that the practices of modern Christianity are pagan? Is what typically occurs in a church supported by what the Bible teaches about the church?
Many Christians recognize that some pagan ideas and practices have infiltrated the Christian church. Sadly, much of what Jesus Christ abolished by His death and resurrection, the early Christians re-established. Jesus' sacrifice fulfilled God's requirements, ending the need for any further sacrifices (Hebrews 7:27; 10:10; 1 Peter 3:18). The early church, due to pagan influences, warped the celebration of the Lord's Supper into a re-sacrifice / re-offering of Christ's once-for-all sacrifice. Jesus' perfect sacrifice abolished the need of a formal priesthood (Hebrews 10:12-14), creating instead a "kingdom of priests" (Revelation 1:6; 5:10). The early church, again influenced by paganism, re-established a priesthood that added a barrier between the "ordinary" believer and God (1 Timothy 2:5; Hebrews 9:15). These are just two of many possible examples.
Most Christians wholeheartedly agree that beliefs / practices such as these need to be rejected and the biblical truth upheld.
It is undeniable that pagan ideas and practices have crept their way into the Christian church. To varying degrees, every church has practices that are not completely based in Scripture, either in the practice itself or in the understanding of the practice. But again, this does not mean these practices are pagan or wrong. Churches would do well to continually re-evaluate their methods and motivations, to make sure they are biblically solid. While no church practice should contradict Scripture, a church practice does not have to be explicitly biblical to be a viable choice. Nor does a practice not being taught in the Bible make it pagan. A practice having a pagan origin does not necessarily make it unbiblical. The key to avoiding "pagan Christianity" is comparing every belief and practice with Scripture and removing anything that contradicts what the Bible prescribes for the church. For those issues on which the Bible is silent, the church leadership should prayerfully consider whether or not to continue them.
For other issues raised by Pagan Christianity, please read the following articles: