It isn't that circles per se are bad, Bridget. But when they are used as religious symbols, they invariably---somewhere back in their history---represent the sun god. Sun worship is a basic and fundamental component of the original false religion---the cult of Babylon: Tammuz was worshiped as the "sun god," the conquerer of winter, born in late December---the prototype for virtually all false Messiahs. Satan loves to blend paganism with the worship of the true God: it's one of his primary tools, one Yahshua specifically warned us about in Revelation 2. Another "circle" instance I ran across: the dragon venerated in the far East is often associated with a magical pearl (a circle in two dimensional representation) that gives him the ability to fly through the air, according to the legends.

kp