Was Christianity new?  Was Christianity unique?

There are similarities between Christianity an Paganism that we've forgotten.

10% tithing
eclipse of the sun marking great divine events
killing babies at the announcement of a kings birth
other ancient people though pigs were unclean
Jewish circumcision copied from Egyptians, say the ancients
frankinsense an myrrh were spices given to Gods in Pagan ritual
"giving up the ghost" a greek phrase, a greek idea
fast before baptism—early Christians and Pagans both did it

Dionysus
Cybele
Great Mother

Oracles: Pythia
Sybil
Alexander and Glycon