Here is an interesting site that shows how many aspects of the Jesus myth are not at all unique to christianity.;
10 Christ-like Figures Who Pre-Date Jesus - Listverse
Here is another site that accurately compares the christian myths of Mithra, a mythical savior whose story predated the Jesus myth by about 600 years.
Jesus and Mithra - FreeThoughtPedia
The list of copy-cat aspects of his story are remarkable and no christian can explain away why their myth is so similar to one 600 years before about a different person.
Many scholars of religions have suggested that the myth of Mithra and Jesus are about the same guy. The 600 year time shift presents a problem for that theory and any christian would have a hard time dismissing the vast numbers of, not just similarities, but exactly replicated story lines that occur over half a millennium apart..
BTW the exact site of the Vatican is where an ancient temple to Mithra once stood.