Some say the circle stands for the Roman sun-god Invictus, thus giving the name of Celtic Sun Cross. Others say it represents the halo of Jesus Christ. Others simply see it as a holdover from its pagan roots as a sun symbol. Feb 3, 2015
What are the pagan symbols of Christianity?
The pagan cross symbol was “Christianized” into mainstream Christianity. But God’s one true Church has never done this. It has always seen the cross symbol for what it is-pagan! The Bible clearly teaches that God’s people must not practice or tolerate any pagan ways, customs, traditions or practices (Deut. 7:1-6; Jer.
Reference: rcg.org/questions/p096.a.html