yes, thats true loki, all history is biased, only the winners get to write it.
well there are more pagan things in christianity besides the sun thing. theres a zues type God (look at michalangeo's depiction of God on the sistine chapel, i wonder where i got that idea, floating on a cloud sending sparks). look at the devil, a horned dude. the pagan god of fertility has horns too.
the purpose of this was to either give easy transitions to pagans becoming christians, or to get rid of paganism.