why do we really celebarte christmas

Christmas is one of my holidays . sure there is a the gifts , and also people seem to me much nicer to one another . we have different tradtions that we have that has been pass down to generation to generation , but why then do we celebarte christ birthday in dec when he was really born in the spring ? if you think about christ was bron in bethelem if you locate that that is in the northern hesmphrise which is winter , a big part on why i know is christ was bron in the spring is the christmas story of luke ch 2 :8 it reads 8And there were in the same country shepherds abiding in the field, keeping watch over their flock by night. . if you know anything thing about shephreds they never watch they sheep at winter night it to cold , and there is no green pastsure , in the spring time there is green pasture and also that is the time of year most shepherds have sheep out at night time . so why then do we celebarte christmas in winter if his brithday was in spring , well it was because , centeries ago the was a man name st nick who gave gifts to children , which was celebarate on dec 6 and then also others celebrate something on jan 6 , and so a counsel out together and decidice of dec 25 because it was in between the dec and jan 6 , it is the same way on how trinty became one in reality they are three sperate beings and the bible clearly states that they are sperate beings but the reason why christmas is celebarte is because of the atonement of christ , that baby who came to mary was only a baby , but the reason why the heavens opens and the angles sang was becasue they knew that the savior or the world was bron and that salavtion to man has come and the promise that god gave to the world before the world was made that there will a way back for all man kind to come to him and also he would brake the bands of death , that baby did fullfill one of the best saying i have herd was there will be no christmas if there wasn't for easter , we christ is in christmas because of the atonmement the greatest gift of all ,