Take your oick & just read both links to the end with an open mind.
The easy one 1st.
http://www.truthbeknown.com/first-christmas.html
& the ultimate pick holes in this if U will it's a PDF so you may have to google 'Gods arrival in India' & it is the top link ( at least in all the times I have tried)
A wonderful read - & when one come to a logical conclusion from what is put forth then it goes to show the con jobs of all religions - but hey what do I know - read for yur own eyes.
[PDF] God's Arrival in India - Eastern Tradition Research Institute www.easterntradition.org/gods%20arrival%20in%20india.pdf?