we do not know exactly the year when jesus is born, and honestly,in my opinion, we respect and worship jesus only because the vaishnava acharyas, srila prabhupada included, have said that he really exist, he's an avatara and an enlightened spiritual master... otherwise the "legend" surely would prevail

so the year is not sure and the date 25december is surely wrong, because He was born while there was a census by the roman occupants, and they made things like that in march or april

the reason of this date is because the christians wanted to merge in jesus other previous pagan legends and popular pagan deities (like mitra??)



we devotees celebrate anything (licit!!!) if we can have sankirtan and prasadam distribution.. and in some temples i have seen special "sunday-like" feasts with guests (bhajan, class, kirtan, prasadam) in x-mas

and it is surely nice