None of the biblical christ mythology is really that original. even early church fathers knew this and resorted to a quite silly explanation "diabolical mimicry" egad, the devil tried to trick everyone by doing it first! oy.
Do the research on your own, i am not a mythology expert, don't recall what I have read enough to spout off example after example, but then again, looking for it on your own would be more persuasive anyway, wouldn't it?
here is a site to get you started.
http://www.medmalexperts.com/POCM/getting_started_pocm.html
research the facts on your own, to verify.
the salvation bringer, the virgin births, the born in a cave/born in a manger, mortal mother/god father, and on and on and on.....
and, there is no written account of Jesus outside of the Bible. Josephus' writings are widely known/accepted as being falsified by many/most scholars. the romans were prolific writers and historians at that time. we know all about the defeat of verciforax, or whatever the hell that guy from gaul was named, yet the SON OF GOD doesn't deserve a little bit of writing?
and in regards to proof of Pauls teachings of your sister, who cares? Paul didn't even know christ. I think it is galatians where it is said he preached christianity for 3 years before going to meet disciples in jerusalem. and not original disciples even.
what a crock of shite. i am shocked christianity has gotten this far really, when you dig in and really research it.
Im inclined to believe in the "gnostic paul" theory. his teachings apparently were distorted by the church. what a shocker!
those are just a few reasons I don't believe in a literal christ, but the pagan christ myth is vitally important, imo. it just went downhill when idiots started to take it literally.
and should it even bothered to be mentioned something as obvious as the birth being celebrated at the winter solstice and the death and resurrection in spring. *yawn*