I think this best sums it up:
There is no evidence that for the first 300 years after Christ’s death, those claiming to be Christians used the cross in worship. In the fourth century, however, pagan Emperor Constantine became a convert to apostate Christianity and promoted the cross as its symbol. Whatever Constantine’s motives, the cross had nothing to do with Jesus Christ. The cross is, in fact, pagan in origin. The
New Catholic Encyclopedia admits: “The cross is found in both pre-Christian and non-Christian cultures.” Various other authorities have linked the cross with nature worship and pagan sex rites.
Why, then, was this pagan symbol promoted? Apparently, to make it easier for pagans to accept “Christianity.” Nevertheless, devotion to any pagan symbol is clearly condemned by the Bible. (
2 Corinthians 6:14-18) The Scriptures also forbid all forms of idolatry. (
Exodus 20:4, 5; 1 Corinthians 10:14)[FONT=Verdana, Arial, Tahoma, Calibri, Geneva, sans-serif]