actually trini is correct. the large majority of the roman empire was pagan (worshipping the sun not satan). the conversion and baptism of constantine and the roman empire was done on essentially his deathbed and was done to unify his empire politically, religiously and to unify his territory.

most of all symbology of catholicism and christanity has been "borrowed" from various other religions that don't even exist today. even the most sacred of days...christmas was borrowed from mithraism and the pagan sol invictus. they both celebrated a birth festival on dec. 25. before the 4th century jesus' b-day was celebrated on january 6